Driving at intersections

The thumb rule: Straight traffic gets priority over turning traffic.

Traffic Logic: You have to slow down for a turn anyway. It is easier to stop when slower. This is true for both straight roads and crossings.

Rule: Main road traffic has priority over side road traffic.

Traffic Logic: Main road traffic is faster than side road traffic. Main roads are also more crowded. If main road traffic stops for side road traffic, there will be a jam. Side roads are less likely to have enough traffic to cause a jam.

Rule: If the driver is to leave the roundabout less than halfway around it, the driver must enter the roundabout from the left marked lane or left line of traffic.

Traffic Logic: This rule applies to drivers who will leave the roundabout at the first exit after entering the roundabout, or when the exit is less than halfway around the roundabout. By keeping to the left lane and keeping the left turn indicator on during this time, the driver is saved the trouble of first switching to the right lane and then working his/her way back to the left. 

Rule: If the driver is to leave the roundabout more than halfway around it, the driver must enter the roundabout from the right marked lane or right line of traffic.

Traffic Logic: By switching to the right lane immediately after entering the roundabout, a driver who has to travel at least halfway around it is saved the trouble of negotiating around other drivers who are exiting the roundabout, and those who are entering the roundabout from other intersection points.

Rule:  On T junctions, traffic going straight gets priority.

Traffic Logic: You have to slow down for a turn anyway. It is easier to stop when slower.