I do not see the realism in placing a stinger from the car in the first place, but since it already exists and is a fait accompli for us, then specifying a time limit will make that a little acceptable
It doesn't seem like a bad idea to me, I think it helps to regulate the use of this feature a bit. In what I do not agree that it is 5 seconds, I think that 3 is more than enough, considering that the uses that will be given will be in a context where you must act quickly to avoid being killed by criminals. Also, keep in mind that the vehicles that have this feature are heavy vehicles with low speed and acceleration, compared to other police vehicles. If the time is reduced to 3 seconds my vote will be positive, meanwhile my vote will be neutral.