We assess public support for three supply-focused transport regulations: vehicle emissions standards (VES), low-carbon fuel standards (LCFS), and zero-emissions vehicle (ZEV) sales mandates. We implemented a survey across several regions with varying policy experience, using representative samples from Canada (n=1,552) and the US state of California (n=484). The survey evaluated respondents’: (1) awareness of each policy, (2) support and opposition for these policies, and (3) associations with personal characteristics. We find that policy awareness is similarly low in all regions, with fewer than 5% mentioning any of the policies in an open-ended question. Once prompted with multiple-choice style questions, stated awareness is higher for a VES (33–53%), followed by a LCFS (19–38%), and then a ZEV mandate (6–17%). In some cases, awareness is higher in regions that actually had a given policy in place, or for a longer period. Support for strong VES and LCFS is similarly high across regions (around 60–80% support) and support for a strong ZEV mandate is lower (34–55% support) – though all have higher support than strong carbon pricing (22–30%). Regression analyses indicate that policy support is most strongly associated with respondent values and trust in government, with only a minor role for demographic factors. Interaction effects indicate that policy support in the province of Quebec and California is associated with a lack of trust in the federal government but greater trust in provincial or state governments. Conclusions indicate that policymakers may want to focus on policies that are both effective and acceptable to the public.

我们评估了公众对三项以供应为重点的运输法规的支持：车辆排放标准（VES），低碳燃料标准（LCFS）和零排放车辆（ZEV）销售指令。我们使用来自加拿大（n = 1,552）和美国加利福尼亚州（n= 484）。该调查评估了受访者的以下方面：（1）对每项政策的意识；（2）对这些政策的支持和反对；（3）具有个人特征的联想。我们发现，所有地区的政策意识都同样较低，在一个开放性问题中提到任何政策的比例不到5％。一旦出现多项选择风格的问题提示，对VES的陈述意识较高（33-53％），其次是LCFS（19-38％），然后是ZEV要求（6-17％）。在某些情况下，在实际上已经实施了既定政策或更长时间的地区，人们的意识较高。在各个地区，对强大的VES和LCFS的支持程度相似（约60–80％的支持），对强有力的ZEV要求的支持也较低（34–55％的支持），尽管所有这些都比强劲的碳定价高（22–30％ ）。回归分析表明，政策支持与受访者的价值观和对政府的信任最密切相关，而人口因素的作用很小。相互作用的影响表明，魁北克省和加利福尼亚州的政策支持与对联邦政府缺乏信任，但对省或州政府的信任度较高有关。结论表明，政策制定者可能希望专注于既有效又为公众所接受的政策。