Red flashing lights.   If red lights flash on a signal in the central  reservation or on the side of the road and lane closed sign is  showing, you MUST NOT go beyond the signal in any lane.  Laws RTA 1988 sect 36 & TSRGD regs 10 & sch15  259. Joining the motorway.   When you join the motorway you will  normally approach it from a road on the left (a slip road) or from  an adjoining motorway. You should  ● give priority to traffic already on the motorway  ● check the traffic on the motorway and match your speed to  fit safely into the traffic flow in the left-hand lane  ● not cross solid white lines that separate lanes or use the  hard shoulder  ● stay on the slip road if it continues as an extra lane on the  motorway  ● remain in the left-hand lane long enough to adjust to the  speed of traffic before considering overtaking.  260. When you can see well ahead and the road conditions are good,  you should  ● drive at a steady cruising speed which you and your vehicle  can handle safely and is within the speed limit (see  4.On the motorway  highwaycodeuk.co.uk 134  3.Joining the motorway 