I-405 Improvement Project
The Project will add one new General Purpose lane and one new toll lane in each direction along the 16-mile corridor of I-405 between State Route 73 (SR 73) and Interstate 605 (I-605). The new tolled express lanes will combine with the existing high occupancy vehicle (HOV) lane to create two Express Lanes in each direction in the I-405 median from SR 73 to I-605. The I-405 Express Lanes will include single lanes connecting to/from the SR-73 to the I-405 at the southern end of the 405 Express Lanes and to/from the I-605 and the SR-22 at the northern end of the 405 Express Lanes.
The Project will also consist of the replacement of 18 bridges, the construction of new and widened bridges, improvements to the auxiliary lanes, relocations of utilities, construction of new sound walls, and additions to the tolling and Transportation System Management and Transportation Demand Management systems.