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Speed Indicator Device (SID) Report – (Awaiting updates from SCC)

Please find attached the latest speed indicator device, (SID), reports for Bridgwater Town Council, taken on the NDR (west bound) between the 5^th February 2018 and the 16^th February 2018.

This installation replaced the scheduled installation for week commencing 1th September 2017 which was cancelled due to the installer being absent from work.

The median speed was calculated at 32mph which is 2mph above the posted speed limit of 30mph. The 85%ile speed was calculated as 36mph which equates to the intervention limit speed of 36mph.

Please note that the speeds shown in the report are the approach speeds of vehicles as recorded by the device and do not reflect the ‘adjusted’ speeds which the motorists may switch to on being ‘reminded’ of the posted speed limit by the device. This means the speeds shown are probably an accurate reflection of the speeds normally experienced at this location. Where we have been able to measure ‘adjusted’ speeds at other locations we have found there has been an average reduction in speed between the approach speed and adjusted speed of approximately 4-5mph.

The intervention limit is the speed, (under the current policy), at which a location is deemed to have a speeding issue. It is calculated by taking the posted speed limit, adding 10% and then adding a further 3mph, (this equates to 25mph in a 20mph posted speed limit; 36mph in a 30mph posted speed limit and 47mph in a 40mph posted speed limit). Locations that equal or exceed the intervention level speed qualify for a SID installation on a regular basis, (please note that if this location is already included in the SID programme it will continue to receive a temporary SID on a regular basis irrespective of the above results).

Download the February Graph here

Download the February Table here

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