The bill H.503, introduced by a group of representatives, aims to delay the implementation of the Advanced Clean Truck rule by five years. This rule, which is designed to regulate emissions from heavy trucks, would now apply starting with model year 2036 instead of the previously established model year 2031.

The proposed legislation reflects a shift in the timeline for compliance with emissions standards for heavy trucks, allowing manufacturers and stakeholders additional time to adapt to the new regulations. The bill is currently referred to the Committee for further consideration.