Trump plan rolls back Biden diesel rules, touts trucking relief

Trump administration proposes rolling back Biden-era heavy-duty truck emissions rules, arguing it would save about $12 billion for truckers and lower prices for goods by eliminating DEF-related deratings and speed restrictions on new highway and nonroad engines, while preserving roughly 90% of NOx reductions and easing emissions-warranty requirements; supporters say the changes boost supply-chain efficiency and consumer prices while maintaining environmental protections.