When is the best time to change up a gear on a roundabout?
The best time to change up a gear on a roundabout is as soon as you've accelerated onto it, almost in a straight line and before you start steering round the roundabout, as you'll need to keep the car in control.
Timing is important.
You have to check your mirrors and signal to exit a roundabout so it's easier to change gear before you start that routine if you have time.
What if it's a small roundabout?
It's not always safe to accelerate as much and change gear if it's a small roundabout. Especially if you're driving round a mini roundabout. Staying in 1st gear would be best for control if you're turning right around these.