When you come across roadworks

You only have to obey the signs when there are workers about
You only have to obey the signs during working hours
You must obey the signs that are displayed at all times
Explanation: When entering a highway construction or maintenance area, scan for workers in bright coloured vests. Pay close attention to any worker that is directing traffic and follow their directions. Just because you do not see workers after passing a warning sign, that does not mean they are not out there on the road.

