Toll roads in SoCal no longer accept cash or even CC. The toll collection stations are now fully automated. Without an electronic pass your car is photographed for toll collection.
BEWARE - the signs indicate that you have 48 hours from the time of the toll to visit
https://www.thetollroads.com/ and pay your toll. DO NOT BE LATE!!
Tried paying our toll 3 days after the fact (our fault we forgot) and was denied. Now expecting a invoice (more CA taxes) that includes a $50+ fine per infraction. We used 2 toll roads that day
IMO 48 hours is unreasonable. Yes this was my fault for not making the payment a priority. Drivers with busy lives beware.