Accidents can often happen at road-works when drivers fail to observe simple rules of safety. So
These are temporary systems where traffic travelling in opposite directions shares the same carriageway.
They allow traffic to keep moving during repairs or alterations on the other carriageway.
The lanes are often narrower than normal lanes. Red and white marker posts separate traffic travelling in opposite directions and fluorescent or reflective bright green/yellow studs often replace normal ones.
Note
While contraflow systems are usually found on motorways, they may also be used on other roads carrying fast-moving traffic.
Minor maintenance work may sometimes be carried out without the need for major lane closures. Slow moving or stationary works vehicles, with a large arrow on the back of the vehicle, are used to divert traffic to the right or left as appropriate.
There are no cones or other delineators when these vehicles are being used.
Driving on motorways places greater demands on the driver's skill, observation, anticipation, planning and concentration.
It's important that you get proper guidance before you attempt to drive on your own on a motorway.
If you've recently passed your test, not driven for a while, or your driving hasn't included busy fast-moving traffic, your decision-making skills might not be up to the standard needed.
So you should
The next move you make on a motorway always has to be the right one.
Bear in mind that the vehicles on either side and behind you could weigh over 30 tonnes and be travelling at 50-60 mph or even faster.