Traffic Lights, Signs and Controls: Do I Need to Stop at the Line if Contruction Worker Gesturing to Keep Moving

My question involves a traffic ticket from the state of: California

I was stopped and got a ticket for "FAIL TO STOP AT LIMIT LINE WHEN RED LIGHT FLASHING".

In fact there were construction workers at the intersection and one of them was kind of regulating the traffic (stood on the road gesturing to drivers). At the time I was approaching stop line he was clearly gesturing to me to keep moving. I did not do a full stop and kept moving.

So am I guilty?

Traffic Lights, Signs and Controls: Do I Need to Stop at the Line if Contruction Worker Gesturing to Keep Moving