Sen. Frank Lautenberg (D-N.J.), a longtime advocate of transportation safety and infrastructure, will not seek reelection in 2014, he announced Thursday.
Lautenberg has continuously pushed to improve trucking safety, including a proposal enacted last year to mandate electronic logging devices to track drivers' hours of service on all trucks.
He has also pushed against increasing truck size and weight regulations and advocated for more laws to crack down on drunk driving.
Lautenberg, who leads the subcommittee responsible for surface transportation within the Senate's Commerce, Science and Transportation committee, has focused much of his work since his 1982 election on improving passenger rail service and infrastructure.
"While I may not be seeking re-election, there is plenty of work to do before the end of this term and I'm going to keep fighting as hard as ever for the people of New Jersey in the U.S. Senate," he said in a statement.