There have been calls for mandatory geo-fencing software, which would stop these incursions automatically, and for the rules to be applied more stringently.
An automaker needs to spend less money and less time on fuel economy and emissions improvement if they're making and selling an SUV because it falls under a category that is less stringently regulated.
如果制造和销售 SUV,汽车制造商需要在燃油经济性和排放改善方面花费更少的资金和时间,因 SUV 属于监管不那么严格的类别。