Sir – Oxford’s economy, and its environment are dependent on large numbers of us walking, cycling and catching the bus. Too many people still drive, getting in each other’s way. When they get the chance, too many drivers still go too fast, making conditions unpleasant for walking, cycling, and when catching the bus.

It’s sometimes possible to force people to stop doing wrong — which seems to be Hugh Jaeger’s rather vindictive approach (Letters, January 27) — but the cost usually far exceeds the benefits. The latest thinking is that we should instead put the emphasis on reminding people about realistic good behaviour, exploiting people’s natural inclination to do the right thing.

So having got to the point where most people think that 20mph is fast enough on most of Oxford’s roads, the 20mph limit acts as a clear and simple reminder of what is expected. There are a few places where contrary indications (such as excessive lane-width) need to be removed, but the general approach is in line with nudge theory.

In a similar vein, cycling is a realistic alternative for many short car journeys, and should be positively encouraged.

There are undoubtedly times when cyclists’ behaviour could be better, but if nudge theory is to work, there has to be a realistic alternative good behaviour.

As with driving, the realistic alternative is generally to slow down and be careful.

Richard Mann, Cyclox