
There's a long uphill gradient ahead
Vehicles fitted with speed limiters must use that lane
Only lorries and buses are allowed to use that lane
There's a steep downhill section ahead
Explanation: Where a motorway has a long or steep gradient, slow-moving large vehicles might get in the way of other traffic. To help the traffic flow, an extra lane - called a crawler lane - is sometimes found on these gradients. This helps the traffic to flow by providing the slower heavy vehicles with a dedicated lane on the left.
Category: The Road
References: The Official DVSA Guide to Driving Buses and Coaches: Section 4, The Official DVSA Guide to Driving Goods Vehicles: Section 4
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