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agricultural vehicles such as a tractor with a trailer or other fixed equipment, will obscure your view of the road ahead and there may be another slow-moving vehicle in front 

● make sure that you have enough room to complete your overtaking manoeuvre before committing yourself. It takes longer to pass a large vehicle. If in doubt do not overtake 

● not assume you can follow a vehicle ahead which is overtaking a long vehicle. If a problem develops, they may abort overtaking and pull back in. 

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165. You MUST NOT  overtake 

● if you would have to cross or straddle double white lines with a solid line nearest to you (but see Rule 129) 

● if you would have to enter an area designed to divide traffic, if it is surrounded by a solid white line 

