Road signs are also good.
Signs such as "Stop", "No overtaking", speed limit signs and many others are fairly universally recognised, and can be used for "You must stop here", "you mustn't pass other cars", etc etc.
They're quick to prepare - you can draw them fairly quickly, even if your drawing skills are not very good, like me!
You can use them for a roleplay game, where one student is a driving instructor explaining the Highway code, and the other is learning to drive. The instructor explains all the signs, and then the learner has to try and remember what they all mean, and repeat them back to the instructor. Or something along those lines!
Hope this helps.