Thought that too, but no.
It seems, that even the level modellers just placed the lights themselves. Because in No Mercy 1 the alarm car yellow turn lights on the front side are placed too much inside of the car and are almost not visible. Instead in No Mercy 2 you see the lights very clearly.
And it seems GetAngleVectors() inbuilt function of sourcemod is some kind "wrong". It rotates vectors sometimes at the wrong axis.
I am using now my own method to rotate the vector (like in the book) and it works perfectly.
I will release a new version definitely today.
Edit:
Updated to v1.0.2.
Fixed versus, fixed all cars blinking and added removing commands and pitch/roll are now working correctly.