REGARDING the serious road accident in Langho which resulted in a woman driver being injured (LET, April 3), this was yet another under the railway bridge on the A666, happening when a lorry with a hydraulic arm collided with the structure.

Obviously, many drivers of high vehicles have not observed the 'Low Bridge' warning sign as it is evidently not large enough or clear enough.

It appears farcical, however, that the drivers in these accidents seem not to know the height or size of their loads.

Recently, I drove on the A674 -- by-passing Withnell where there is a warning sign which, on the approach of vehicles, flashes a warning for drivers to slow down.

All the vehicles ahead of my car slowed so it is obvious that this type of warning is having some success.

No doubt the police officers and Ribble Valley Council could consider a similar sign which, when illuminated, could read 'Low Bridge Ahead -- High Vehicles Stop.'

With satellite navigation systems being fitted in many new cars, probably in the near future, goods vehicles could be fitted with one which will inform drivers of any approaching obstruction, namely low railway bridges.

DOUG MOSS (Mr), Whalley Old Road, Blackburn.