20mph speed limits and zones

20mph speed limits or zones may be considered on streets suitable for speeds lower than 30mph, such as those where pedestrians and cyclists, especially children, frequently share the space with motor traffic.

A plan of all existing 20mph limits and zones in Swindon is available to download below:

20mph speed limits

20mph speed limits may be introduced on a section of road, a single street or multiple streets across a small area. The limit is signed at the beginning and end together with repeater signs at regular intervals.

For a 20mph limit to be effective existing average speeds must be 24mph or lower, or else the introduction of traffic calming measures will be required.

A 20mph limit will only be considered where:

  • existing average traffic speeds are 24mph or lower
  • pedestrian and cycle movements are high
  • there is evidenced community support

20mph zones

20mph zones are introduced over a number of street across a wide area. The boundary of the zone is marked by signs at all entry and exit points. 20mph zones are often used where average speeds are higher than 24mph and traffic calming is introduced to influence vehicle speeds.

The introduction of a 20mph zone with traffic calming will only be considered where:

  • existing average speeds are below 30mph
  • there is a history of personal injury accidents
  • pedestrian and cycle movements are high
  • there is evidenced community support
  • the area does not include routes on the strategic road network.

Additional information

  • traffic calming is not appropriate on road with high volumes of HGV's
  • the introduction of vertical traffic calming (speed cushions) can result in increased noise disturbance
  • residents may be more aware of vibrations as a result of traffic passing over vertical traffic calming

If you feel a road or area may be appropriate for a 20mph speed limit or zone and think that the location meets the criteria above, then please contact your local Ward Councillors.

Any change to a speed limit will require an amendment to the Traffic Regulation Order (TRO). Please see the Traffic regulation Order webpage for further information.

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