I'm going to work on the principle that you have passed your driving test; do you check your mirrors whilst driving (as opposed to when you put your make-up on)? How long does it take? It's just a fraction of a second isn't it, same with the speedo. Any experienced driver should be able to check their speed without any impact on their driving and any experienced driver should be able to guestimate their current speed if their actions (they lift or depress the gas pedal) or the road conditions (they meet a hill) cause a change in speed.
If you need one of these devices to check your speed you need some further tuition and to re-take your test as you are a danger to yourself and all other road users.
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@Carl Williams
I'm going to work on the principle that you have passed your driving test; do you check your mirrors whilst driving (as opposed to when you put your make-up on)? How long does it take? It's just a fraction of a second isn't it, same with the speedo. Any experienced driver should be able to check their speed without any impact on their driving and any experienced driver should be able to guestimate their current speed if their actions (they lift or depress the gas pedal) or the road conditions (they meet a hill) cause a change in speed.
If you need one of these devices to check your speed you need some further tuition and to re-take your test as you are a danger to yourself and all other road users.