Traffic Merges Ahead from the Left Sign – Diagram 509.1 | Permanent UK Traffic Sign

£7.29 – £71.86

Warning sign – alerts drivers that traffic will be merging onto the main carriageway from the left, ensuring caution and safe lane adjustments.

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⚠️ Traffic Merges Ahead from the Left Sign – Diagram 509.1 | Permanent UK Traffic Sign

It is an official UK warning sign that alerts drivers to merging traffic from a left-hand slip road or junction. This sign is essential for preventing sudden lane changes, improving traffic flow, and enhancing road safety. It is fully compliant with TSRGD regulations and is typically found on motorways, dual carriageways, and busy main roads where vehicles merge onto high-speed lanes.

📍 Where is the Traffic Merges from the Left Sign Used?

This sign is commonly placed in areas where vehicles are expected to merge from a left-side slip road or secondary carriageway:

Motorway entry slip roads where vehicles join fast-moving traffic
Dual carriageways with merging lanes
Urban roads where minor roads merge into major roads
Busy intersections or roundabouts with feeder lanes
High-speed roads where clear lane discipline is required

By warning drivers of merging traffic, this sign helps reduce sudden braking, lane-switching confusion, and potential collisions.

⚠️ Ensuring Smooth & Safe Merging

The Traffic Merges Ahead from the Left Sign (Diagram 509.1) helps:

✅ Alert drivers on the main carriageway to expect merging vehicles
✅ Encourage merging vehicles to adjust speed and position safely
✅ Reduce the risk of side-impact and rear-end collisions
✅ Improve overall traffic flow and lane discipline

With its clear triangular warning design and black merging lane symbol, this sign provides instant recognition for all road users.

📏 Highly Visible, Durable & Weather-Resistant

This official UK warning sign is built for long-term outdoor use, ensuring maximum visibility and durability in all conditions.

✔️ Retroreflective surface for clear visibility in day and night conditions
✔️ Weatherproof and corrosion-resistant materials for long-lasting performance
✔️ TSRGD-compliant – fully meets UK road safety regulations

🛠 Easy Installation & Multiple Size Options

The Traffic Merges Ahead from the Left Sign – Diagram 509.1 is available in various standard UK road sign sizes and materials to fit different locations.

✔️ Pre-drilled holes for quick and secure installation
✔️ Multiple size options for motorways, dual carriageways, and urban roads
✔️ Compatible with post-mounting systems for easy setup

✅ Why Choose This Sign?

✔️ Official UK warning sign for left-side merging traffic
✔️ Highly visible & reflective for maximum safety compliance
✔️ Weatherproof & durable for long-term outdoor use
✔️ Prevents sudden lane changes & improves traffic efficiency
✔️ Fully compliant with UK TSRGD traffic regulations

📌 Summary

Traffic Merges Ahead from the Left Sign – Diagram 509.1 warns that vehicles will be merging onto the main road from the left.
Encourages caution and safe lane adjustments for smoother merging.
Highly visible, durable & weatherproof for long-term outdoor use.
Ideal for motorway entry points, dual carriageways, and busy urban roads.
Fully compliant with TSRGD UK traffic sign regulations.

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Driving rules

The reflective materials used are weather resistant and designed for outdoor application. The range consists of three classes including RA1, R2/RA2, and R3B/R3C. The outdoor service life for each class of material is as follows: