# US Automotive Natural Gas Vehicle Market > US Automotive Natural Gas Vehicle Market Research Report By Fuel Type (CNG, LNG) and By Vehicle Type (Light-duty Vehicle, Medium-duty Vehicle, Heavy-duty Vehicle) - Forecast to 2035 - **Forecast Period:** 2025 - 2035 - **CAGR:** 4.75% - **2024:** $ 1,800 Million - **2025:** $ 1,885.5 Million - **2035:** $ 3,000 Million - **Key Players:** Volkswagen (DE), Fiat Chrysler Automobiles (IT), Honda (JP), Mercedes-Benz (DE), Renault (FR), Scania (SE), MAN (DE), Iveco (IT), Ford (US) **Report ID:** MRFR/AT/14163-HCR · **Pages:** 100 · **Author:** Triveni Bhoyar & Sejal Akre · **Last Updated:** July 23, 2026 **URL:** https://www.marketresearchfuture.com/reports/us-automotive-natural-gas-vehicle-market-15690 --- ## Market Summary ## **US Automotive Natural Gas Vehicle Market Overview:** As per MRFR analysis, the US Automotive Natural Gas Vehicle Market Size was estimated at 1.9 (USD Billion) in 2023. The US Automotive Natural Gas Vehicle Market Industry is expected to grow from 2.5 (USD Billion) in 2024 to 4 (USD Billion) by 2035. The US Automotive Natural Gas Vehicle Market CAGR (growth rate) is expected to be around 4.365% during the forecast period (2025 - 2035). **Key US Automotive Natural Gas Vehicle Market Trends Highlighted** The US Automotive Natural Gas Vehicle Market is witnessing significant trends driven by various factors. One of the key market drivers is the growing emphasis on reducing greenhouse gas emissions and improving air quality. Natural gas vehicles (NGVs) are seen as a cleaner alternative to traditional gasoline and diesel vehicles, which aligns with the US government's goals for environmental sustainability. Policy incentives, including tax credits and grants for NGV infrastructure development, further support this shift towards cleaner fuels, promoting wider adoption among businesses and consumers. There are also increasing opportunities in the logistics and public transportation sectors, where fleet operators are looking to reduce fuel costs and minimize their environmental footprint. As more municipalities and private companies adopt NGVs, the demand for natural gas refueling stations is rising. Investments in fueling infrastructure are crucial for the growth of the NGV market in the US, providing an expanded network for drivers and encouraging more brands to enter the market. Recent trends indicate a greater collaboration between automotive manufacturers and natural gas suppliers to create innovative solutions that enhance the performance and convenience of NGVs. Furthermore, advancements in vehicle technology are making NGVs more efficient, appealing to consumers who prioritize both cost-effectiveness and sustainability. Various educational initiatives also seek to raise awareness about the benefits of NGVs among the public, which may lead to higher adoption rates in the coming years. Overall, the convergence of environmental policies, technological advancements, and changing consumer behaviors is shaping the future of the US [Automotive Natural Gas Vehicle Market](../../../reports/automotive-natural-gas-vehicle-market-5750). Source: Primary Research, Secondary Research, _Market Research Future_ Database and Analyst Review **US Automotive Natural Gas Vehicle Market Drivers** **Increasing Government Support and Incentives** In recent years, the US government has taken significant steps to promote the use of natural gas vehicles (NGVs) through various incentive programs and funding initiatives. Programs established by organizations such as the Department of Energy (DOE) have allocated millions of dollars towards the development of NGV infrastructures and technology. For instance, the DOE's Alternative Fuels Data Center reports that there are over 1,500 public compressed natural gas (CNG) refueling stations across the US, which significantly increases the adoption rate of NGVs.The support from the government not only reduces the initial cost burdens for consumers but also positions NGVs as a practical alternative to traditional gasoline vehicles, stirring positive momentum in the US Automotive Natural Gas Vehicle Market Industry. **Rising Environmental Awareness and Concerns** Growing concerns about environmental sustainability and the impact of fossil fuel consumption have driven consumers and companies to seek cleaner alternatives. According to the Environmental Protection Agency (EPA), transportation accounted for approximately 29% of total greenhouse gas emissions in the US in 2022. This statistic highlights a significant contribution of vehicles to climate change, prompting action. Natural gas vehicles typically emit fewer pollutants compared to gasoline or diesel vehicles, making them an attractive option for environmentally conscious consumers. The trend towards sustainability is therefore set to enhance growth within the US Automotive Natural Gas Vehicle Market Industry. **Volatility of Oil Prices** The consistently fluctuating prices of crude oil significantly affect consumer preferences for fuel options. In times of unstable oil prices, natural gas prices tend to remain relatively stable, providing an enticing alternative for cost-conscious consumers. The US Energy Information Administration (EIA) noted that from 2021 to 2023, the price of crude oil saw significant spikes, prompting many fleet operators to explore NGVs as a reliable and economically stable fuel option. This shift is expected to bolster the growth of the US Automotive Natural Gas Vehicle Market Industry as consumers and businesses aim to mitigate the financial impact of unpredictable oil prices. **Advancements in Natural Gas Vehicle Technology** Technological advancements in natural gas vehicles have greatly improved their efficiency, performance, and safety features. Major automotive manufacturers in the US, like Ford and General Motors, are investing in Research and Development efforts to enhance engine technologies, tank efficiency, and overall vehicle performance related to NGVs. These advancements lead to increased consumer acceptance and adoption rates in the automotive market. As reported by the Society of Automotive Engineers, the efficiency of NGVs has seen a significant uptick of around 30% in just the last 5 years, which reflects positively on the US Automotive Natural Gas Vehicle Market Industry as more consumers recognize the benefits of these modern vehicles. **US Automotive Natural Gas Vehicle Market Segment Insights:** **Automotive Natural Gas Vehicle Market Fuel Type Insights** The US Automotive Natural Gas Vehicle Market is characterized by a significant focus on fuel types, primarily consisting of Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG). CNG is widely utilized due to its availability and cost-effectiveness, offering an environmentally friendly alternative to gasoline and diesel, while contributing to reduced greenhouse gas emissions. The rising awareness of environmental concerns among consumers and stricter government regulations regarding vehicle emissions have propelled the demand for CNG vehicles. This fuel type is particularly popular in public transportation and commercial fleets, where operational efficiencies can lead to substantial cost savings over time. On the other hand, LNG, though less common than CNG, plays a crucial role in heavy-duty transportation and long-haul trucking, where the energy density of LNG permits longer travel distances on a single load compared to CNG. It also opens up opportunities in sectors such as shipping and rail, where the substantial energy requirements necessitate the advantages of LNG. The market trends suggest a gradual shift towards adopting alternative fuel vehicles, driven by technological advancements in engine designs and fuel infrastructure developments. Furthermore, various incentives provided by government agencies stimulate the adoption of natural gas vehicles across the United States, driving market growth. As part of the broader US Automotive Natural Gas Vehicle Market segmentation, the fuel types reflect not only consumer preferences but also a significant transition towards sustainable practices in the automotive sector. The growth in natural gas as a vehicle fuel aligns with national initiatives for energy independence and carbon reduction. However, challenges such as infrastructure support for LNG and the perception barriers around natural gas vehicle performance need addressing to fully realize the market potential. Overall, a focus on both CNG and LNG within the fuel type segment highlights pivotal shifts happening in the automotive industry, ultimately aiming for more sustainable transportation solutions across the US. Source: Primary Research, Secondary Research, _Market Research Future_ Database and Analyst Review **Automotive Natural Gas Vehicle Market Vehicle Type Insights** The US Automotive Natural Gas Vehicle Market is primarily categorized into three vehicle types, namely Light-duty Vehicles, Medium-duty Vehicles, and Heavy-duty Vehicles, each playing a vital role in the overall market dynamics. Light-duty Vehicles, which include passenger cars and light trucks, significantly contribute to the adoption of natural gas as a cleaner energy source, driven by increasing regulatory pressure for lower emissions and improving fuel economy. Medium-duty Vehicles are essential for commercial operations and delivery services, benefiting from the cost-effectiveness of natural gas, making them an attractive option for fleets looking to manage fuel expenses. Heavy-duty Vehicles, encompassing buses and freight trucks, have also embraced natural gas, with many municipalities and companies transitioning to these vehicles due to their robust performance and reduced environmental impact. The growth in the natural gas infrastructure across the US further supports these segments, offering more refueling stations and encouraging manufacturers to produce more models. This diversification within the Vehicle Type category showcases not only the growing acceptance of natural gas vehicles but also the potential for market expansion as sustainability becomes a priority across various transportation segments. **US Automotive Natural Gas Vehicle Market Key Players and Competitive Insights:** The US Automotive Natural Gas Vehicle Market presents a dynamic landscape characterized by increasing regulatory pressures to reduce emissions and a growing demand for alternative fuel vehicles. As major automakers pivot towards sustainable solutions, the competition intensifies among established players and new entrants alike. The market's growth is propelled by technological advancements in natural gas engine designs and the development of a robust refueling infrastructure. Companies are not just vying for market share but also for technological supremacy, collaborating with energy providers and investing in research and development to innovate and enhance vehicle offerings. Competitive insights reveal how each player leverages its strengths, such as brand reputation, distribution networks, and consumer loyalty, to carve out a niche in this evolving market. Toyota Motor Corporation has a considerable presence in the US Automotive Natural Gas Vehicle Market and has strategically positioned itself as a leader in sustainable transportation solutions. The company's strengths lie in its extensive experience in hybrid technology, which it seamlessly integrates with natural gas vehicle offerings. Toyota's commitment to research and development has enabled it to develop vehicles that deliver impressive fuel efficiency and reduced emissions while maintaining performance reliability. In addition to its technological prowess, Toyota's established dealer network ensures broad accessibility for customers, enhancing its competitive edge. The company's long-term sustainability vision and proactive approach to engaging with regulatory bodies further strengthens its foothold in the natural gas market. Nissan is also a key player in the US Automotive Natural Gas Vehicle Market, with a focused agenda on enhancing its portfolio of natural gas vehicles. The company's prominent offerings include models designed for commercial fleets, which often emphasize cost-effectiveness and lower operational expenses. Nissan's strengths in this market are tied to its robust engineering capabilities and commitment to environmental stewardship. The company has been involved in various partnerships aimed at expanding its range of natural gas vehicles while simultaneously increasing its market reach. Recent mergers and acquisitions have bolstered Nissan's resources and technological advancements, allowing it to stay competitive while addressing the growing consumer demand for cleaner transportation options. With a solid reputation for reliability and performance, Nissan continues to leverage its market presence to cater to a customer base eager for innovative fuel solutions. **Key Companies in the US Automotive Natural Gas Vehicle Market Include:** **US Automotive Natural Gas Vehicle Market Industry Developments** _The US Automotive Natural Gas Vehicle Market has seen various developments recently. Notably, Cummins has expanded its lineup of natural gas engines, aiming to offer more sustainable solutions in the heavy-duty truck segment. In October 2023, Ford Motor Company announced its plan to enhance the natural gas vehicle offerings for its fleet, aligning with current green initiatives. Meanwhile, Toyota Motor Corporation has been focusing on R&D for hydrogen fueling technologies which closely align with natural gas applications. The market valuation for natural gas vehicles is positively impacted by increased governmental support for cleaner fuels._ _Major automakers like Nissan and Honda are also exploring natural gas technology, while Hyundai and Volkswagen are expanding their partnerships with alternative fuel technology firms. In September 2023, Isuzu reported increased sales in its natural gas truck models, indicating growing consumer acceptance. In terms of mergers, although no recent mergers or acquisitions have occurred among the listed companies during the current year, prior activities suggest a trend towards consolidating resources for developing cleaner vehicle technologies. The past two years have shown a significant uptick in the government’s commitment to natural gas infrastructure, further benefitting this niche market._ **US Automotive Natural Gas Vehicle Market Segmentation Insights** **Automotive Natural Gas Vehicle Market Fuel Type****Outlook** **Automotive Natural Gas Vehicle Market Vehicle Type****Outlook** ## Market Drivers ### Government Policy and Support Government policies and support play a crucial role in shaping the automotive natural-gas-vehicle market. Various federal and state initiatives are being implemented to promote the use of NGVs, including tax incentives, grants, and funding for infrastructure development. For instance, the U.S. Department of Energy has allocated substantial funds to support natural gas vehicle projects, which has led to a marked increase in public and private investment in this sector. As a result, the automotive natural-gas-vehicle market is poised for growth, as favorable policies encourage both manufacturers and consumers to embrace natural gas as a viable fuel alternative. ### Rising Environmental Awareness The automotive natural-gas-vehicle market is experiencing a notable shift due to increasing environmental awareness among consumers. As concerns about air quality and climate change intensify, individuals are gravitating towards cleaner fuel alternatives. Natural gas vehicles (NGVs) emit significantly lower levels of harmful pollutants compared to traditional gasoline and diesel vehicles. This shift is reflected in the growing adoption of NGVs, with a reported increase of approximately 15% in sales over the past year. The automotive natural-gas-vehicle market is thus positioned to benefit from this heightened consciousness, as consumers seek sustainable transportation options that align with their values. ### Economic Viability of Natural Gas The economic advantages of natural gas as a vehicle fuel are becoming increasingly apparent, driving growth in the automotive natural-gas-vehicle market. With natural gas prices remaining relatively stable and often lower than gasoline or diesel, consumers and fleet operators are recognizing the cost-saving potential of NGVs. Reports indicate that operating costs for NGVs can be up to 30% lower than their gasoline counterparts. This economic viability is particularly appealing to commercial fleets, which are increasingly adopting NGVs to reduce fuel expenses. Consequently, the automotive natural-gas-vehicle market is likely to see continued expansion as more stakeholders prioritize cost efficiency. ### Fleet Adoption and Commercial Use The automotive natural-gas-vehicle market is witnessing a surge in fleet adoption, particularly among commercial operators. Businesses are increasingly recognizing the benefits of NGVs for their fleets, including lower fuel costs, reduced emissions, and potential tax incentives. Reports indicate that fleet operators can achieve a return on investment within a few years due to the lower operating costs associated with NGVs. This trend is particularly evident in sectors such as public transportation and logistics, where fuel efficiency is paramount. As more companies transition to natural gas vehicles, the automotive natural-gas-vehicle market is expected to expand significantly, driven by the demand for sustainable and cost-effective transportation solutions. ### Technological Innovations in NGVs Technological advancements in the automotive natural-gas-vehicle market are enhancing the performance and appeal of NGVs. Innovations in engine design, fuel storage, and emissions control systems are making NGVs more efficient and user-friendly. For example, advancements in composite materials for fuel tanks have improved safety and reduced weight, thereby increasing vehicle range. Additionally, the integration of smart technologies is enabling better monitoring of fuel consumption and emissions. These innovations are likely to attract a broader consumer base, as the automotive natural-gas-vehicle market evolves to meet the demands of modern drivers seeking both performance and sustainability. ## Future Outlook The [Automotive Natural Gas Vehicle Market](https://www.marketresearchfuture.com/reports/automotive-natural-gas-vehicle-market-5750) is projected to grow at a 4.75% CAGR from 2025 to 2035, driven by environmental regulations, fuel cost advantages, and technological advancements. **New opportunities:** - Expansion of natural gas refueling infrastructure in urban areas. - Development of hybrid natural gas-electric vehicle models. - Partnerships with logistics companies for dedicated natural gas fleets. By 2035, the market is expected to achieve substantial growth, driven by innovation and strategic partnerships. ## Segment Insights ### By Fuel Type: CNG (Largest) vs. LNG (Fastest-Growing) CNG dominates the fuel type segment of the US automotive natural-gas-vehicle market, representing a significant portion of the overall market share with its established infrastructure and widespread availability. In contrast, LNG is emerging as the fastest-growing segment, driven by advancements in technology and increasing demand for long-haul transportation solutions. As both fuel types continue to evolve, the shift towards cleaner energy alternatives creates opportunities for growth in their respective areas. The growth trends in this segment are largely influenced by environmental regulations and the need to reduce carbon emissions. CNG, being more readily available and suited for urban applications, remains the preferred choice for lighter vehicle fleets. Conversely, LNG is gaining traction in heavy-duty applications, particularly for freight and logistics, pushing manufacturers to innovate and expand LNG refueling infrastructure nationwide. CNG (Dominant) vs. LNG (Emerging) CNG is characterized by its established presence in the market, supported by a robust infrastructure that facilitates easier refueling for fleets, particularly in urban areas. It is a reliable choice for city buses and delivery vehicles, making it the dominant fuel type among natural-gas vehicles. On the other hand, LNG is considered an emerging fuel type, offering significant advantages for long-haul trucking and heavy-duty vehicles due to its higher energy density and longer range capabilities. The ongoing development of LNG technology and refueling stations positions it well for future growth as more operators seek efficient, clean energy solutions. ### By Vehicle Type: Light-Duty Vehicle (Largest) vs. Heavy-Duty Vehicle (Fastest-Growing) In the US automotive natural-gas-vehicle market, the market share distribution among vehicle types showcases a clear dominance of light-duty vehicles. This segment accounts for a significant portion of the overall market, driven by consumer preferences for fuel-efficient options and lower operational costs associated with natural gas. Meanwhile, medium-duty and heavy-duty vehicles, while smaller in share, are increasingly adopted for commercial applications, reflecting a shift towards green mobility solutions. Growth trends indicate that heavy-duty vehicles are emerging as the fastest-growing segment within this market. The rising demand for sustainable transportation solutions, coupled with supportive regulations and incentives, is propelling this segment. Meanwhile, light-duty vehicles continue to maintain their market position due to advancements in technology and increasing consumer awareness about the benefits of natural-gas vehicles, indicating a promising future for both segments. Light-Duty Vehicle (Dominant) vs. Heavy-Duty Vehicle (Emerging) Light-duty vehicles are the dominant force in the US automotive natural-gas-vehicle market, offering drivers a blend of efficiency and reliability. These vehicles are usually favored for personal use, featuring compact designs and lower emissions, which appeal to environmentally conscious consumers. On the other hand, heavy-duty vehicles are becoming increasingly prominent as an emerging segment, primarily in the freight and transportation industries. The shift towards natural gas as a cleaner fuel solution has allowed these vehicles to gain traction, with enhanced capabilities for hauling and reduced operational costs. As environmental regulations tighten, both segments are expected to evolve, catering to the growing demand for greener alternatives in transportation. ## Competitive Benchmarking The automotive natural-gas-vehicle market is currently characterized by a competitive landscape that is both dynamic and evolving. Key growth drivers include increasing environmental regulations, rising fuel prices, and a growing emphasis on sustainable transportation solutions. Major players such as Volkswagen (DE), Honda (JP), and Ford (US) are strategically positioning themselves through innovation and partnerships. Volkswagen (DE) has focused on enhancing its natural gas vehicle offerings, while Honda (JP) emphasizes fuel efficiency and eco-friendliness in its product line. Ford (US) is actively exploring collaborations with energy companies to expand its natural gas infrastructure, thereby shaping a competitive environment that prioritizes sustainability and technological advancement.In terms of business tactics, companies are increasingly localizing manufacturing and optimizing supply chains to enhance efficiency and reduce costs. The market structure appears moderately fragmented, with several key players exerting influence over their respective segments. This fragmentation allows for a variety of strategies to coexist, fostering competition that drives innovation and customer choice. In October Volkswagen (DE) announced a significant investment in a new production facility dedicated to natural gas vehicles in the Midwest. This move is expected to bolster local manufacturing capabilities and reduce lead times, thereby enhancing Volkswagen's competitive edge in the North American market. The strategic importance of this investment lies in its potential to meet growing demand for cleaner transportation options while also supporting local economies. In September Honda (JP) unveiled a new line of natural gas vehicles that incorporate advanced fuel cell technology. This development not only aligns with global sustainability goals but also positions Honda as a leader in innovation within the natural gas segment. The introduction of these vehicles is likely to attract environmentally conscious consumers and strengthen Honda's market share. In August Ford (US) entered into a partnership with a leading energy provider to develop a comprehensive natural gas refueling network across the United States. This strategic alliance aims to address one of the significant barriers to natural gas vehicle adoption—refueling infrastructure. By enhancing accessibility, Ford is likely to increase consumer confidence in natural gas vehicles, thereby driving sales and market penetration. As of November current competitive trends indicate a strong focus on digitalization, sustainability, and the integration of AI technologies within the automotive sector. Strategic alliances are increasingly shaping the landscape, allowing companies to leverage shared resources and expertise. Looking ahead, competitive differentiation is expected to evolve from traditional price-based competition to a focus on innovation, technological advancements, and supply chain reliability. This shift underscores the importance of adaptability and forward-thinking strategies in maintaining a competitive edge in the automotive natural-gas-vehicle market. ## Recent News & Developments _The US Automotive Natural Gas Vehicle Market has seen various developments recently. Notably, Cummins has expanded its lineup of natural gas engines, aiming to offer more sustainable solutions in the heavy-duty truck segment. In October 2023, Ford Motor Company announced its plan to enhance the natural gas vehicle offerings for its fleet, aligning with current green initiatives. Meanwhile, Toyota Motor Corporation has been focusing on R&D for hydrogen fueling technologies which closely align with natural gas applications. The market valuation for natural gas vehicles is positively impacted by increased governmental support for cleaner fuels._ _Major automakers like Nissan and Honda are also exploring natural gas technology, while Hyundai and Volkswagen are expanding their partnerships with alternative fuel technology firms. In September 2023, Isuzu reported increased sales in its natural gas truck models, indicating growing consumer acceptance. In terms of mergers, although no recent mergers or acquisitions have occurred among the listed companies during the current year, prior activities suggest a trend towards consolidating resources for developing cleaner vehicle technologies. The past two years have shown a significant uptick in the government’s commitment to natural gas infrastructure, further benefitting this niche market._ ## Report Scope | MARKET SIZE 2024 | 1800.0(USD Million) | | --- | --- | | MARKET SIZE 2025 | 1885.5(USD Million) | | MARKET SIZE 2035 | 3000.0(USD Million) | | COMPOUND ANNUAL GROWTH RATE (CAGR) | 4.75% (2025 - 2035) | | REPORT COVERAGE | Revenue Forecast, Competitive Landscape, Growth Factors, and Trends | | BASE YEAR | 2024 | | Market Forecast Period | 2025 - 2035 | | Historical Data | 2019 - 2024 | | Market Forecast Units | USD Million | | Key Companies Profiled | Volkswagen (DE), Fiat Chrysler Automobiles (IT), Honda (JP), Mercedes-Benz (DE), Renault (FR), Scania (SE), MAN (DE), Iveco (IT), Ford (US) | | Segments Covered | Fuel Type, Vehicle Type | | Key Market Opportunities | Growing demand for cleaner transportation fuels drives innovation in the automotive natural-gas-vehicle market. | | Key Market Dynamics | Growing regulatory support for cleaner fuels drives interest in automotive natural-gas-vehicles amid shifting consumer preferences. | | Countries Covered | US | ## Frequently Asked Questions **Q: What is the current valuation of the US automotive natural-gas-vehicle market?** A: The market valuation was $1800.0 Million in 2024. **Q: What is the projected market valuation for the US automotive natural-gas-vehicle market by 2035?** A: The market is projected to reach $3000.0 Million by 2035. **Q: What is the expected CAGR for the US automotive natural-gas-vehicle market during the forecast period 2025 - 2035?** A: The expected CAGR is 4.75% during the forecast period 2025 - 2035. **Q: Which fuel types are included in the US automotive natural-gas-vehicle market segments?** A: The market segments include CNG and LNG, each valued between $900.0 Million and $1500.0 Million. **Q: What are the vehicle types represented in the US automotive natural-gas-vehicle market?** A: The vehicle types include Light-Duty, Medium-Duty, and Heavy-Duty vehicles, with valuations ranging from $300.0 Million to $1500.0 Million. **Q: Who are the key players in the US automotive natural-gas-vehicle market?** A: Key players include Volkswagen, Fiat Chrysler Automobiles, Honda, Mercedes-Benz, Renault, Scania, MAN, Iveco, and Ford. **Q: How does the market valuation for Light-Duty Vehicles compare to Heavy-Duty Vehicles?** A: Light-Duty Vehicles are valued between $900.0 Million and $1500.0 Million, whereas Heavy-Duty Vehicles are valued between $300.0 Million and $600.0 Million. **Q: What is the significance of the projected growth in the US automotive natural-gas-vehicle market?** A: The projected growth indicates a potential increase in market interest and investment, with a valuation rise to $3000.0 Million by 2035. **Q: What trends are influencing the growth of the US automotive natural-gas-vehicle market?** A: Trends include increasing environmental awareness and the push for alternative fuel vehicles, which may drive market expansion. **Q: How do the valuations of CNG and LNG compare within the market segments?** A: Both CNG and LNG segments are valued similarly, ranging from $900.0 Million to $1500.0 Million. --- *This Markdown endpoint is provided for AI systems and LLM crawlers. 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