Traffic controls have been repaired.
If Possible, Avoid Los Angeles Ave and First St. 
***UPDATE***
The interstection controls have been restored to normal function. Thank you all for your patients and understanding during the traffic congestion.
Original message
Due to a malfunctioning traffic control signal, traffic is heavily congested in the area of First St. and Los Angeles Ave. Signal Maintenance has been notified but their estimated time to fix the issue is unknown. If possible, avoid this intersection.
Madera Rd and Erringer Rd are good alternate routes for north south traffic. Cochran St. and Royal Ave. are good alternate routes for east west traffic.
Address/Location
Simi Valley Police Department
3901 Alamo St
Simi Valley, CA 93063
Contact
Emergency: 9-1-1
Non-emergencies: 805-583-6950