From the traffic flow speeds - that dash-cam owner was likely extremely lucky that the traffic light turned red when it did. Or (s)he would have been right under the plane when it "arrived."
Looks like it was the impact with the traffic lights themselves that actually split the plane's fuel tank and caused the fuel explosion.
OTOH, the fuel exploding and burning off before ground contact probably contributed to the survivability. Most of the released fuel was "back there" in a black cloud over the highway. Not surrounding the wreckage.