Stop lines, lane arrows and reserved road space

Stop lines and yield lines

A stop line identifies where the front of your vehicle must remain when you are required to stop. It runs across the approach, rather than along the lane. Find it before reaching the junction so you can stop smoothly without projecting into the crossing.

A yield line identifies where to give priority to road users crossing your path. It is commonly drawn as a row of triangular markings across the approach. Slow down enough to observe and stop if necessary. A yield marking remains a control even if the roadside yield sign is missing.

Do not confuse these transverse markings with lane boundaries. Their purpose is to control entry into a crossing or junction, not to indicate a place to park.

Key idea: Find the stopping or yielding position before entering the conflict area.

Mandatory lane arrows and guide lines

A mandatory direction arrow in a lane requires the indicated movement at the junction. A left arrow, straight arrow or combined arrow controls the lane you occupy. Choose the appropriate lane early while a change remains lawful and safe.

Guide lines through a large intersection help you follow the correct path without drifting into a neighbouring turning stream. Follow the intended line while checking that other drivers also remain in their permitted paths. An arrow does not give priority over a red signal, pedestrian crossing or conflicting traffic.

If you choose the wrong lane, follow a safe permitted movement and adjust the route later. Do not cross a channelising line or painted island abruptly to reach the desired turn.

Key idea: The lane arrow controls direction; the signal and priority rules still control entry.

Box junctions and painted islands

A marked box junction keeps the intersection’s shared space clear. Do not enter unless there is enough space beyond it to continue without stopping in the box and blocking another movement. A green signal does not create that missing space.

A painted traffic island channels vehicles around a reserved part of the road. Do not routinely drive, stop or park over it. The reference describes officer-direction and collision-avoidance or emergency exceptions; those are not everyday shortcuts around a queue.

A channelising line separates permitted paths and restricts crossing. Watch continuity or lane-ending warnings early, and choose the route while a lawful lane change remains available.

Key idea: Do not use a box or island as a place to wait or bypass traffic.

Reserved lanes and parking bays

Bus-lane markings identify space reserved for buses during the periods shown by the controlling signs. Cycle-lane lines define space for cyclists. A motorcar must not use a reserved lane merely because it appears empty. Read times and vehicle-class conditions with the markings.

Parking-bay lines define the allowed space for the whole vehicle. Exclusive bays may use a symbol or lettering for a specified group such as buses, taxis, emergency services or an authorised loading use. Check the associated sign rather than guessing from a single letter.

A yellow edge line beside an ordinary road and a bus-lane marking are not interchangeable. The road layout, symbols and signs establish whether you are looking at a shoulder or reserved roadway.

Key idea: Identify the user, place and time condition before entering reserved space.

Quick recap

• Stop and yield markings identify entry controls.
• Mandatory arrows apply to the lane.
• Keep box junctions and painted islands clear.
• Reserved lanes require the right user and signed conditions.