Chevron Markings / Channelising Lines

Chevron markings (channelising lines) are regulatory and prohibitory road markings widely applied at complex junctions, expressway slip road merging and diverging zones, or road narrowing and widening stretches. They typically consist of solid white lines in V-shaped chevrons, diagonal hatching, or cross-hatching enclosed within a solid white border, densely filled with parallel diagonal stripes. As a vital road safety feature designed to streamline traffic flow and guide vehicles safely, chevron markings play a pivotal role in eliminating traffic conflict points and standardising driving trajectories.

Core Attributes and Legal Status

The core legal rule governing chevron markings is the "absolute prohibition of straddling, crossing, or stopping/parking."

Under road traffic regulations, the area marked by chevrons is treated as an independent safety buffer zone and does not form part of the drivable traffic lane. Although the paint and colour may resemble standard road markings, motorists are strictly forbidden from allowing vehicle tyres to run over or cross these markings, let alone making U-turns, reversing, or parking within the painted island zone. This mandatory visual and physical segregation is engineered to guide intersecting or chaotic traffic onto the correct lanes, thereby drastically reducing sideswipes and rear-end collisions caused by abrupt lane-cutting or reckless driving.

Main Applications and Engineering Design

Traffic authorities strategically demarcate chevron markings at high-risk road nodes based on geometric road alignments and traffic conflict analysis.

On expressways and urban highways, chevron markings are standard safety installations at interchange slip roads, exit gore areas, entry merge tapers, as well as complex multi-leg junctions and lane-drop sections (where multiple lanes merge into fewer lanes). From an engineering perspective, the dimensions and layout of the chevrons are precisely calculated according to prevailing road speeds and road width. Certain sections are also fitted with raised pavement markers (road studs/cat's eyes) and high-visibility retroreflective materials to ensure drivers can clearly identify the prohibited zones at night or during adverse weather conditions.

Driving Guidelines and Safety Risks

Strict compliance with chevron marking regulations is essential to avoid severe traffic summonses and to ensure high-speed driving safety.

When approaching a junction or expressway slip road demarcated with chevrons, drivers should anticipate their route well in advance via navigation prompts or directional signboards, completing lane changes early along the broken line sections. Once entering the immediate vicinity of chevron markings, vehicles must remain strictly within their designated lanes. Abruptly crossing the lines, hard braking, or stopping within the chevron zone due to a missed exit or wrong turn is strictly illegal. Such reckless manoeuvres often trigger severe rear-end smashes or cause high-speed trailing traffic to lose control and overturn.