What's the national speed limit on a motorway for a lorry weighing over 7.5 tonnes? What's the national speed limit on a motorway for a lorry weighing over 7.5 tonnes?

• Possible answers:

   
• A. 50 mph (80 km/h)
• B. 55 mph (88 km/h)
• C. 60 mph (96 km/h)
• D. 70 mph (112 km/h)