Requires DEP to implement Advanced Clean Trucks regulations no earlier than January 1, 2027.

S 3817 delays New Jersey's implementation of Advanced Clean Trucks (ACT) regulations from January 1, 2025, to January 1, 2027. The bill affects vehicle manufacturers of medium- and heavy-duty trucks and buses, requiring them to gradually increase zero-emission vehicle sales (capping at 40-75% by 2035). It directly modifies the current timeline by prohibiting the Department of Environmental Protection (DEP) from enforcing these rules before 2027. This is a procedural change to the existing 2021 DEP adoption of California's ACT regulations, not a modification of the regulations themselves.