CA-73 is mostly tolled and you can use this to bypass the El Toro Y Interchange and both ends of CA-73 end on the San Diego Freeway (I-5 from the south and I-405 from the north) making that highway a short bypass of the San Diego Freeway. If you want to go back to I-5 and this time in the Santa Ana Freeway, while you're in CA-73 heading northbound, head north of CA-55 and end towards I-5 entering the Santa Ana Freeway.
CA-73 is mostly tolled and you can use this to bypass the El Toro Y Interchange and both ends of CA-73 end on the San Diego Freeway (I-5 from the south and I-405 from the north) making that highway a short bypass of the San Diego Freeway. If you want to go back to I-5 and this time in the Santa Ana Freeway, while you're in CA-73 heading northbound, head north of CA-55 and end towards I-5 entering the Santa Ana Freeway.
Are you clinching the 73?