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Horse's brass

Observant drivers on the M4 may have noticed lots of horses crossing one of the bridges recently. This is part of an exercise by the Highways Agency to discover exactly which conditions horses like. It is rewriting its construction regulations, as apparently all previous versions have been based purely on anecdote. This time it is taking a more systematic approach, trying out different balustrading, surfacing materials, etc. The agency is not the only group taking a renewed interest ...

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