Use sat-navs to identify speeding motorists

SIR – John Brandon (Letters, July 20) is right that speed limits are ignored by countless motorists.

Many offenders drive with sat-navs, which could surely be given a vehicle identification number, and alert the DVLA if the car was speeding. Notice of this could be sent automatically to the registered owner, who would be obliged to identify the driver, so that a speeding fine could be issued.

Pat Cooper

Stoke Bruerne, Northamptonshire

SIR – Some roads in my village will be designated Quiet Lanes, which I and others applaud. However, ours, which is one of them, has a 60mph speed limit. This makes a mockery of the concept, especially as a separate application for a “speed order” is required. This is not exactly joined-up legislation, particularly as the cashstrapped parish council may have to fund this application.

Nick Kester

Wattisfield, Suffolk

SIR – It makes perfect sense to have a 20mph speed limit in residential areas where it can improve safety and the quality of the environment. But on vital urban arteries it simply causes unnecessary congestion and consequent poor air quality.

It is farcical that cyclists (who ignore this and most other laws) overtake cars on both sides and make sensible driving a nightmare. Furthermore, halving traffic flow by creating dedicated cycle lanes results in cyclists having to proceed alongside stationary traffic emitting the very pollution the policy was designed to avoid.

Tony Jones

London SW7

SIR – Third gear is optimised at around 23mph, giving fuel-efficient driving at this speed (Letters, July 21). I have long wished for more sensible 25mph zones, which would allow use of the apt slogan: “Twenty-five saves lives”. Kenneth Wilshire

Cheam, Surrey