Traffic Merges from Left Sign – Diagram 509.1 | Temporary UK Traffic Sign

🚧 Traffic Merges from Left Sign – Diagram 509.1 | Temporary UK Traffic Sign

The Traffic Merges from Left Sign (Diagram 509.1) is a temporary UK traffic sign used to warn drivers that vehicles will be joining the main carriageway from the left. This sign is essential in areas where a lane reduction, slip road, or temporary diversion requires traffic to merge safely. It helps prevent sudden lane changes, reduce congestion, and minimize collision risks by ensuring drivers anticipate merging traffic.

With its high-visibility triangular design, red border, and black merge symbol, this sign is instantly recognizable, alerting motorists to adjust their driving accordingly. Fully TSRGD-compliant, it is widely used on motorways, A-roads, temporary roadworks, and slip-road junctions where merging traffic requires clear signage for safe lane integration.

⚠️ Enhances Safety & Smooth Traffic Flow

This temporary road sign plays a crucial role in helping drivers make safe and controlled lane transitions while preventing lane-change confusion.

✅ Warns drivers that traffic is merging from the left
✅ Reduces last-minute lane changes that can lead to accidents
✅ Ensures smooth integration of merging vehicles into traffic flow
✅ Improves road safety by allowing motorists to prepare for merging lanes

By providing clear and early warning, this sign helps create safer driving conditions for both merging and main carriageway vehicles.

📏 Highly Visible, Durable & Weather-Resistant

Designed for temporary use in roadwork zones, junctions, and slip roads, this official UK road sign is built for maximum durability and visibility.

✔️ Bold triangular design with a clear merge symbol for instant recognition
✔️ Retroreflective surface ensures high visibility in low-light and night-time conditions
✔️ Weatherproof and corrosion-resistant materials for long-lasting outdoor use
✔️ TSRGD-compliant, making it suitable for official road management and temporary lane adjustments

These features ensure motorists can quickly identify merging traffic zones, reducing the risk of sudden braking or swerving.

🛠 Quick Installation & Portable Design

The Traffic Merges from Left Sign (Diagram 509.1) is lightweight and easy to install, making it ideal for temporary traffic control and road safety management.

✔️ Portable and quick to set up for construction crews and traffic management teams
✔️ Compatible with standard traffic sign frames and stands
✔️ Available in multiple sizes to suit different road conditions and traffic speeds
✔️ Ideal for roadworks, slip-road junctions, and temporary lane merges

With fast deployment and repositioning, this sign ensures efficient traffic control and helps drivers prepare for merging lanes.

✅ Why Choose This Temporary Sign?

✔️ Official UK traffic sign for left-side merging traffic
✔️ Highly visible & reflective for enhanced driver awareness
✔️ Weatherproof & durable for outdoor use in all conditions
✔️ Lightweight & portable for quick setup and removal
✔️ Prevents confusion & ensures smooth traffic flow in merging areas
✔️ Fully compliant with UK TSRGD temporary traffic sign regulations

📌 Summary

• Traffic Merges from Left Sign – Diagram 509.1 is a temporary UK traffic sign warning drivers that traffic will merge from the left onto the main carriageway.
• Essential for roadworks, slip-road junctions, and temporary diversions, ensuring safe and controlled lane transitions.
• Highly visible, lightweight, and weather-resistant, ensuring long-term effectiveness in all conditions.
• Easy to set up and relocate, making it ideal for construction sites and traffic control zones.
• Manufactured to TSRGD standards, ensuring full compliance with UK road safety regulations.

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Additional resources:

Driving rules

• The Highway Code
• Legal obligations of drivers and riders