Sir – Is Chris Shipton (Letters, September 10) having a laugh? A citywide speed limit of 10mph for cyclists? Has April the first come early? Apart from the hugely impractical and prohibitively expensive ‘network of average speed cameras augmented with face-recognition technology’ he proposes, such a limit would be totally unrealistic.

For example, my average speed as I cross the city to and from work is a modest 12mph, which means that at times it is somewhat above that figure and sometimes as low as zero (yes — I do stop at traffic lights!).

If I were limited to a maximum speed of 10mph (and how many cyclists have speedometers fitted?), I estimate it would at least double my journey time.

Now, where did I put the car keys?

Rick Taylor, Cumnor