DIAGRAM 620

Diagram 620 – Vehicles Requiring Access are Exempted from the Prohibition Conveyed by the Associated Sign

The Diagram 620 road sign is an important regulatory sign used to indicate that vehicles requiring access are exempt from a specific prohibition. This sign ensures that while general restrictions may apply to a road, certain vehicles with legitimate reasons for entry—such as deliveries, residents, or emergency services—are still permitted.

This sign is frequently installed in restricted zones, pedestrianised areas, private roads, or roads subject to specific traffic regulations. It helps clarify that the restriction is not absolute and that essential access is still allowed under defined conditions.

Sign Meaning and Usage

The Diagram 620 sign features black text on a white background within a black-bordered rectangle, ensuring high visibility and clarity. Its function is to inform drivers that the prohibition imposed by an associated sign does not apply to vehicles requiring access.

Key applications of this sign include:

• Allowing access for residents and businesses despite road restrictions,
• Permitting deliveries, emergency vehicles, and service personnel to enter restricted areas,
• Ensuring controlled access to pedestrian zones, low-traffic areas, and gated communities,
• Helping enforce regulations without causing undue inconvenience.

This sign is typically positioned below a primary restriction sign, such as a ‘No Entry’ or ‘Motor Vehicles Prohibited’ sign, to modify its meaning and clarify access permissions.

Importance of Diagram 620 for Traffic Regulation

1. Maintains Necessary Access – The sign ensures that while a road may be restricted, it remains accessible to those who genuinely require entry, such as residents, businesses, and emergency responders.

2. Prevents Unauthorised Use – By clearly stating that only vehicles needing access are exempt, the sign discourages unauthorised drivers from misusing restricted routes.

3. Reduces Traffic Congestion – This sign helps prevent unnecessary through-traffic in restricted areas, improving overall traffic flow while still allowing essential access.

4. Supports Safety in Restricted Areas – Many restricted roads are designed for pedestrian safety or low-traffic use. This sign ensures that only necessary vehicles enter, minimising potential hazards.

Placement and Compliance Regulations

The Diagram 620 sign is regulated under the Traffic Signs Regulations and General Directions (TSRGD) in the UK. It must be positioned in conjunction with the main prohibitory sign and installed in locations where controlled access is necessary.

For effective use, the sign must be:

• Placed below the primary restriction sign for clarity,
• Clearly visible to approaching motorists, ensuring compliance,
• Maintained in good condition to avoid ambiguity,
• Enforced through local traffic regulations to prevent misuse.

Local authorities and traffic management teams are responsible for installing and maintaining these signs to balance traffic control and essential access.

Key Considerations for Road Users

• Verify access rights before entering restricted areas.
• Ensure compliance with local regulations if using this exemption.
• Avoid misuse of restricted roads unless genuinely requiring access.
• Report damaged or unclear signage to the relevant authorities.
• Be mindful of pedestrians and cyclists in restricted zones.

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