Road Narrows Left Side - TSRGD Diagram: 517 - Road Narrows on One Side Ahead Road Signs

A Road Narrows Left Side sign is used to warn drivers that the roadway will become narrower on the left side ahead. This advance notice helps drivers adjust their speed and position to safely navigate the reduced road width, reducing the risk of collisions or side-swiping with oncoming traffic or roadside obstacles.

The sign should be placed before the point where the road begins to narrow on the left, allowing enough time for drivers to react and drive cautiously. It is commonly found on roads where construction, maintenance work, or permanent features like bridge edges, barriers, or lane reductions cause the left side of the road to become narrower.

By alerting drivers early, this sign enhances safety by preventing sudden surprises and encouraging careful driving through potentially tight spaces. It helps maintain smooth traffic flow and protects both motorists and pedestrians from accidents related to unexpected changes in road width.

Materials Explained

Any product outside of our standard choice of material/size range starts with a 5. This may include items such as rolls of tape, sign frames, floor graphics or banners. Below you can find a more detailed description of the miscellaneous material options available for this sign design.

Class RA1: Manufactured from 3mm aluminium composite with an engineering grade retroreflective sheeting to ensure visibility during day and night. This reflective layer helps headlights bounce light back to drivers, making the sign readable in low-light conditions and offers approximately a 7 years lifespan. Aluminium composite is a lightweight, durable material which holds no scrappage value - reducing the potential for theft. It is weather and rust resistant - overall, RA1 signs are designed to be durable, weatherproof, and highly visible to ensure the safety of road users around temporary worksites.