Speed Survey

A Speed survey is carried out usually for the purpose of determining the level of vision required at the point of contact of two roads or access points or as part of the design process for a new road or junction.

Speed surveys are also used in the evaluation of traffic calming schemes, in a before and after situation, and in relation to a safety examination of the local road network.

Often speed surveys are carried out to either validate or rebut the concerns of third parties, as for example in the context of a planning application or appeal.

Radar speed surveys are carried out in accordance with a Department of Transport standard and dependent on the purpose of the survey are then presented as average or 85th percentile values. In highway design and particularly junction assessment the higher 85th percentile value is always used and “wet weather speeds”, which are lower than dry are used. If the survey is undertaken in dry weather conditions the 85th percentile value is translated by use of computer software to a “wet weather” value.

Speed surveys can be carried out either manually by hand held device or by tubes laid across the road known in the profession as 'automatic traffic counters' (ATC's). Manual traffic counts have the benefit of providing more precise details of the circumstances of the local highway, such as weather conditions, constraints to free flow conditions, high speed emergency vehicles, and by noting and removing 'platoons' of traffic from the survey. ATC’s are in place for a full 24 hour, seven day period and thus a greater range of results and traffic flows is obtained. However because of their nature they will not take into account the factors which an operator would record as part of the manual survey.

Sanderson Associates have extensive experience in providing speed surveys using both means, with our “in house” Genesis Handheld Directional Radar or Laser Speed Guns used for manual collection.

Speed surveys can be carried out as part of access feasibility investigations or as part of a Transport Statement or Transport Assessment. In addition they are often carried out for more simple planning proposals where the suitability of an existing or new access is brought into question by the Local Planning or Highway Authority.

In addition to undertaking the survey Sanderson Associates have in house transport and design engineers who are able to determine design requirements from the results and to comment on layouts and seek to provide amendments, where possible, which move to compliance with the required standard.

Require Assistance with a Speed Survey?

Sanderson Associates have extensive experience in assisting our Clients with Speed Surveys relating to Highway Planning Matters for a wide variety of major and minor developments throughout the whole of the UK, Isle of Man and Ireland.

We would welcome the opportunity to provide you with a competitive fee proposal, simply call Sanderson Associates on 01924 844080 and ask to speak to a member of our Design Team or click here to complete our secure online form.


What our Clients' say:

Swept Path Analysis, New Build House, Testimonial

Wed 15 February 2017

Sandersons were appointed to conduct our swept path analysis study for a modern new build house in London. We found the service personable, attentive and thorough. Further, when confronted by a design problem, they were creative and positively contributed to its resolution. Ben Kirk, Associate, Edgley Design

Transport Statement – Proposed Residential Development, Shipley

Thu 8 December 2016

You were recommended to us for a housing site where you had previous experience of the neighbouring land. Every part of the experience was simple and positive and we have no problem recommending your services and consider you for further works. From us at Lumia Homes part of Incommunities Housing Association we would like to […]

Transport Statement, Proposed Residential Development, 6 Detached Dwellings

Wed 23 November 2016

Mr Greenwood is a highway wizard and worked his magic on the Hardingham scheme, without Sandersons input I am confident this scheme would have not passed… Henry Isotta-Day – Architectural Design Engineer, Clayland Architects

Flood Risk Assessment, Proposed Residential Development, Cobham, Surrey

Fri 28 October 2016

We were very pleased with the service received and the positive outcome for our client, and would not hesitate to recommend for flood risk assessments. Thanks very much for helping us with this project. Malcolm Jenkins, Architect, Malcom Jenkins Associates

Technical Letter in Support of Residential Development

Thu 28 July 2016

Recently worked with Robert in order to turn round a planning application which was being recommended for refusal due to Highways objections at the eleventh hour. On this one we had to really think out of the box quickly to mitigate the concerns. Robert was instrumental in coming up with options and innovative ideas and […]

Stage 3 Road Safety Audit

Mon 25 July 2016

The service provided was professional direct to the point and alternatives were provided on discussion of the reports requirements, a user friendly service in every way to a legacy job with very little background information. Thank you Steven Johnston – Keepmoat Regeneration Ltd

Flood Risk Assessment, Proposed Residential Development.

Fri 8 July 2016

Thank you for your assistance on the Flood Risk assessment in relation to our works being carried out at the house. I would like to add that I only called yesterday seeking advice on a flood risk assessment not knowing what it entails and you have acted extremely quickly. You listened and gave valuable, honest […]

Highways Advice, Proposed Residential Development, Micklepage Paddock

Wed 29 June 2016

I would just like to reiterate my thanks, together with those of my clients, for all the work that you did in assisting to obtain planning permission for the above project. Highways had always indicated that being able to provide adequate sight lines onto the main road would be a major factor in determining this […]

Advice on Site Drainage

Wed 22 June 2016

We consulted Sanderson Associates with regard to a surface water drainage design issue that we had recently. They were prompt in their response to us and were able to cut right through to the heart of the problem and provide advice that was direct and uncomplicated. The information provided satisfied the requirements of the local […]

Highway Advice – Testimonial

Mon 9 May 2016

Bob came to the island as an, ‘expert witness’, in a Planning Appeal, for a sizeable property build, essentially covering the Highway issues. After meeting Bob the day before the Appeal, it was abundantly clear this chap, ‘knew his stuff’. His consummate professionalism, experience and knowledge came though at the Hearing, contributing to the process […]

Speed Survey, Speed Surveys, Surveys, Level of Vision, Traffic Calming Schemes85th Percentile Values, Wet Weather Speeds, Traffic Flows, Transport Assessment Transport Statement, Local Planning, Highway Authority