Los Angeles County Department of Transportation

Find Los Angeles County California departments of transportation, highways, roads, and bridge departments. Departments of transportation provide information on public transport, including roads, highways, bridges, traffic conditions, closures, tolls and travel information.


California Department Of Transportation 21420 Golden Springs Drive Diamond Bar CA 91789 909-598-1152


California Department Of Transportation 28820 The Old Road Valencia CA 91355 661-775-5465

California Department Of Transportation 7301 Slauson Avenue Commerce CA 90040 213-620-2272

California Department of Transportation 11210 Moorpark Street Los Angeles CA 91602 818-769-0205

California Department of Transportation 100 South Main Street Los Angeles CA 90012 213-897-3656

California Department of Transportation 100 South Main Street Los Angeles CA 90012 213-897-3656

California Department of Transportation 5360 West Imperial Highway Los Angeles CA 90045 310-342-6161

California State Transportation Department 7300 Bandini Boulevard Los Angeles CA 90040 213-620-2708

California Transportation Department 7314 Bandini Boulevard Commerce CA 90040 213-620-3110

Gardena Transportation Department 13999 South Western Avenue Gardena CA 90249 310-217-1240

L A County Road Maintenance 14959 Proctor Avenue La Puente CA 91746 626-968-3312

Lancaster Transportation Maintenance Operations 44023 Sierra Highway Lancaster CA 93534 661-723-8417

Long Beach Transportation Department 2211 Santa Fe Avenue Long Beach CA 90810 310-233-7427

Los Angeles County Public Works 5213 Encinita Avenue Temple CA 91780 626-286-3173

Los Angeles County Road Maintenance 161 North Valencia Avenue Glendora CA 91741 626-335-2798

Los Angeles County Road Maintenance 35100 San Francisquito Canyon Road Santa Clarita CA 91390 661-296-1390

Los Angeles County Road Maintenance 19865 East Walnut Drive South Walnut CA 91789 626-964-1518

Los Angeles County Road Maintenance 3637 Winter Canyon Road Malibu CA 90265 310-456-8014

Los Angeles County Road Maintenance 38126 Sierra Highway Palmdale CA 93550 661-947-7173

Los Angeles County Road Maintenance 118 Pony Express Road San Dimas CA 91773 909-599-2119

About Transportation Departments

How does the United States pay for transportation infrastructure and improvements?

The major source of funding for federal highway and transit investment is the Highway Trust Fund. The fund receives revenues from gasoline and other motor fuel taxes and from taxes on heavy trucks and truck tires.

How does electronic toll collection work for drivers that don't have a transponder?

Some states have transitioned to electronic tolls and do not provide lanes for paying tolls by cash. Many states have installed license plate recognition systems for vehicles that do not have a transponder and thus are not equipped for electronic toll collection. This system records the vehicle's license plate as it passes through the toll and generates a bill based on the vehicle's registration information.

Why does highway or road construction take place during the day in some places and at night in other locations?

Highway and road construction schedules are based on a number of different factors, including the safety of workers and the public, the impact on motorists through the work zone, and the impact on area schools and hospitals.