Coun Semlyen does a good line in analogies; must be the PPE degree (Letters, December 6). However, unlike a falling body, a vehicle comes equipped with brakes and a driver with a brain watching out for potential hazards.

She failed to comment on my point that mass is a major factor in impact. The problem is that we were told at the meeting that the average speed on roads getting the 20mph limit is already only 25mph.

If she truly hates 30mph roads why are the main roads being allowed to stay at 30mph? These are the roads where there will be a higher percentage of heavier vehicles.

Finally, my car is noisier and uses more fuel at 20mph. Can she recommend one that does the opposite?

C Page, Gale Lane, Acomb, York.