The problem is that the car is front of you. There’s no way for you to know their speed. The only solution is to drive next to them and match their speed.
There might not be enough lanes though. The only guaranteed way is to get close enough that you can look in through their rear window to see their speedometer.
The problem is that the car is front of you. There’s no way for you to know their speed. The only solution is to drive next to them and match their speed.
Should I then roll down the window and use my extendo-hand to have a thumb war with them?
That’ll make it difficult to take a selfie of the situation. You might need a clear picture of both them and you for legal purposes.
There might not be enough lanes though. The only guaranteed way is to get close enough that you can look in through their rear window to see their speedometer.