The Orange County Transportation Authority, in cooperation with Caltrans, is widening the San Diego Freeway (I-405) between SR-73 and I-605.The project is improving 16 miles of I-405 between the SR-73 freeway in Costa Mesa and I-605 near the Los Angeles County line. Construction updates are as follows: SR-22 On-Ramp from Old Ranch Parkway to Close The Old Ranch Parkway on-ramp to the westbound SR-22