You must keep to the left of these lines. You must not cross these lines to overtake or make a U-Turn but may cross them to enter or leave the road or to go past an obstruction..

Avoiding an obstruction

You are permitted to cross single or double continous lines in order to avoid an obstruction – This does not include a slower moving vehicle or a vehicle stopped in a line of traffic, but may include a fallen tree, a crashed vehicle, or a car that has broken down or is illegally parked. Before crossing the line, you must have a clear view of the road ahead and it must be safe. You must also be very sure that you cross safely because the onus is on you to take the risk of danger into account.

When lanes are marked by broken lines the driver may change lanes when it is safe to do so by indicating the intention through proper signal..

Straddling

When driving on a road marked with Lane Lines, you must keep your vehicle entirely within a lane. It is an offence to straddle a line. The red car in the illustration is straddling the lane line.

Solid Lane Line.

Motorists are expected to change lanes while driving in the Lane Change Zone (marked by lanes with broken lines) so that they are in the appropriate line when they enter the No Lane Changing Zone near the intersection. (marked by Solid Lane Lines) . The red car in the illustration iscommitting an offence.

EDGE LINES

These are continous lines at the edge of the carriageway and mark the limits of the main carriageway upto which a driver can safely venture.

Yellow Edge Line.

You must not stop or park your vehicle in any area where a continous yellow edge line is applied even to pick up or set down passengers or goods..