SUMMARY: NHTSA seeks comments on the economic impact of its regulations on small entities. As required by Section 610 of the Regulatory Flexibility Act@ we are attempting to identify rules that may have a significant economic impact on a substantial number of small entities. We also request comments on ways to make these regulations easier to read and understand. The focus of this notice is rules that specifically relate to passenger cars@ multipurpose passenger vehicles@ trucks@ buses@ trailers@ motorcycles@ and motor vehicle equipment.