The speed limit on I-405 between I-605 and
SR-73 has changed from 65 mph to 55 mph.
The new speed limit was implemented in early October 2018 for the safety of the traveling public and crews during construction of the I-405 Improvement Project. The signs warning motorists of the new 55 mph are installed on the northbound and southbound sides of the freeway in the project area, and on all on-ramps between I-605 and Fairview Road in Costa Mesa.
for more information.