A TRL spokesman said: "Although no manufacturer is likely to make a lorry more than 5.03 metres tall, some are getting close. This doesn't leave much room for manoeuvre, especially as factors such as road resurfacing, tyres and braking - even the effect of wind - can reduce the actual gap available." The height of lorries used to be restricted to 4.5 metres, but the limit was scrapped in 1995.
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