Just do the math!
18 ms latency, at 100km/h.
Distance/time=speed, in meters and seconds.
100km/h is ~33m/s.
after some magic with the formula above gives us, Distance=Spped*time
18 ms=0,018s
0,018*33=0,594m, At 100km/h your car travels almost 0.5 meters before your servos reacts