Why do specialised work vehicles drive with sharp objects projecting from the front?

The front ends of modern cars are subject to tight regulations regarding safety issues in the event of collision with other vehicles and pedestrians. Why, therefore, are agricultural vehicles and JCBs allowed to hurtle along with large pieces of jagged or spear-like metal projecting from the front, often at windscreen height of a family saloon?

Asked on 23 November 2013 by RB, Powderham

Answered by Honest John
Because they are specialised working vehicles and there is no option.
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