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To make sure bricks or debris aren't wedged between the wheels
To check that the load-sensing valve is operating correctly
To make sure the diff-lock is disengaged
To make sure the diff-lock is engaged
Explanation: While driving on a building site, bricks, mud or other debris can become lodged between a lorry's double rear wheels. When you leave the site and increase your road speed, anything lodged between the tyres could be thrown out. This flying debris can be a hazard for drivers of following vehicles and can create dangerous road conditions, especially for motorcyclists.
Category: Vehicle Condition
References: The Official DVSA Guide to Driving Goods Vehicles: Section 2
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