New Speed Limit on M4 Motorway: What You Need to Know

Temporary Speed Limit Alert for M4 Motorway: Swansea Section

Starting from 1st July 2025, motorists travelling on a specific stretch of the M4 motorway in Swansea will need to adhere to a new, temporary speed limit. This change comes as a safety measure introduced by the Welsh Government's Ministers, aiming to protect public safety and prevent potential damage to the road.

Key Details:

• Affected Area: The new speed restriction applies to the M4 motorway from Junction 45 (Ynysforgan) to Junction 46 (Llangyfelach) in Swansea.
• Speed Limit: The speed limit will be reduced to 50 miles per hour.
• Duration: This order is temporary, with a maximum duration of 18 months.

Exemptions:

Certain vehicles are exempt from this speed restriction, including:

• Vehicles used for specific purposes outlined in section 87 of the Road Traffic Regulation Act 1984.
• Military vehicles operated by personnel under orders, who are trained for high-speed driving in response to national security emergencies or for training purposes.

Implementation:

• The speed limit will only be in effect when indicated by traffic signs along the route.
• All current speed-related statutory provisions on this section of the motorway will be temporarily suspended when the new limit is in force.

This temporary speed limit is part of ongoing measures to ensure road safety and efficiency. Motorists are advised to pay attention to road signs and adhere to the new speed limit to avoid penalties. Stay informed about updates as the situation progresses.