Mauritius prohibitory signing includes 'no entry for vehicles more than 2 metres wide' and 'no entry for vehicles having an overall height exceeding 3.5 metres'. What must a driver do when the vehicle exceeds the figure shown?

1. Proceed slowly, since the figure is a design guide rather than a limit
2. Take another route, because the sign bans that vehicle from the road ahead
3. Proceed if the load can be shifted lower or narrower without unloading
4. Proceed, provided a warning triangle is displayed on the vehicle