Using the road: Road junctions.

146: Take extra care at junctions. You should

147: You MUST stop behind the line at a junction with a 'Stop' sign and a solid white line across the road. Wait for a safe gap in the traffic before you move off.
Laws RTA 1988 sect 36 & TSRGD regs 10 & 16

148: The approach to a junction may have a 'Give Way' sign or a triangle marked on the road. You MUST give way to traffic on the main road when emerging from a junction with broken white lines across the road.
Laws RTA 1988 sect 36 & TSRGD regs 10(1), reg 16(1) & 25

149: Dual carriageways. When crossing or turning right, first assess whether the central reservation is deep enough to protect the full length of your vehicle.

Assess your vehicles length and do not obstruct traffic

150: Box junctions. These have criss-cross yellow lines painted on the road (see Other road markings section). You MUST NOT enter the box until your exit road or lane is clear. However, you may enter the box and wait when you want to turn right, and are only stopped from doing so by oncoming traffic, or by other vehicles waiting to turn right. At signalled roundabouts you MUST NOT enter the box unless you can cross over it completely without stopping.
Law TSRGD regs 10(1) & 29(2)

Enter a box junction only if your exit road is clear

Junctions controlled by traffic lights

151: You MUST stop behind the white 'Stop' line across your side of the road unless the light is green. If the amber light appears you may go on only if you have already crossed the stop line or are so close to it that to stop might cause an accident.
Laws RTA 1988 sect 36 & TSRGD regs 10 & 36

152: You MUST NOT move forward over the white line when the red light is showing. Only go forward when the traffic lights are green if there is room for you to clear the junction safely or you are taking up a position to turn right. If the traffic lights are not working, proceed with caution. Allow cyclists and buses time and space to move off when the green signal shows.
Laws RTA 1988 sect 36 & TSRGD regs 10 & 36

153: Green filter arrow. This indicates a filter lane only. Do not enter that lane unless you want to go in the direction of the arrow. You may proceed in the direction of the green arrow when it, or the full green light shows. Give other traffic, especially cyclists, time and room to move into the correct lane.

154: Advanced stop lines. Some junctions have advanced stop lines or bus advance areas to allow cycles and buses to be positioned ahead of other traffic. Motorists, including motorcyclists, MUST stop at the first white line reached, and should avoid encroaching on the marked area. If your vehicle has proceeded over the first white line at the time the signal goes red, you MUST stop at the second white line, even if your vehicle is in the marked area.
Laws RTA 1988 sect 36 & TSRGD regs 10 & 43(2)

Do not encroach on the area marked for cyclists

Turning right

155: Well before you turn right you should

Position your vehicle correctly to avoid obstructing traffic

156: Wait until there is a safe gap between you and any oncoming vehicle. Watch out for cyclists, motorcyclists and pedestrians. Check your mirrors and blind spot again to make sure you are not being overtaken, then make the turn. Do not cut the corner. Take great care when turning into a main road; you will need to watch for traffic in both directions and wait for a safe gap.
Remember: Mirrors - Signal - Manoeuvre

157: When turning at a cross roads where an oncoming vehicle is also turning right, there is a choice of two methods

Road layout, markings or how the other vehicle is positioned can determine which course should be taken.

Turning right side to right side       Turning left side to left side

Turning left

158: Use your mirrors and give a left-turn signal well before you turn left. Do not overtake just before you turn left and watch out for traffic coming up on your left before you make the turn, especially if driving a large vehicle. Cyclists and motorcyclists in particular may be hidden from your view.

Do not cut in on cyclists

159: When turning