Driving.

[TWR]

What would make you give up driving?

[lcg]

other drivers.....

[EcclesCake]

Realising I was no longer safe.

Advice from friends or family, that they considered me to be not safe on the road.

Losing licence and/or insurance.

[Old_Geezer]

Going blind ?

[Canary42]

Sufficient funds to hire a chauffeur.

[Jubz]

The day when I feel hesitant about getting into a car and driving somewhere. Also if other people told me I shouldn't drive, I would hope that I would heed there advice.

[pdq1]

The cost. Over the past year I have driven 25% less to cope with the rising fuel prices.

[Maydup]

A chauffeur.

[Graham-W]

Feeling I may be a hazard to others. Worried I may not easily be able to get out of difficulty if I got into it.

[jacklee]

using your car so little that you begin to feel less confident.
Have just made this decision - I'm 90 and think it's time to call it a day.
Recent mileage is very expensive - from now I think it has to be taxis
jackmin

[Paul22118]

A death certificate with my name on it.

[Sipowicz]

Drinking!

[Mick-Talbot]

When I start cutting people up at roundabouts traveling at speeds of up to and including 10mph.

[Nibble]

When other people had accidents at roundabouts, and I obsessed about them.