Designing safer roads with Traffic Surveys & Visibility Splays
Why Choose Us?
Encon Associates delivers detailed Traffic Surveys, Speed Surveys, and Visibility Splay assessments that determine whether drivers can safely enter and leave your development.
Our Traffic Survey services
What we offer
Our Traffic and Speed Surveys record the number, type, and speed of vehicles in real-world conditions around your development. This data is essential for calculating 85th percentile speeds and determining any road safety measures that might be needed – as well as complying with local authority requirements.
We begin by agreeing the survey locations and timings with you based on what your local authority might expect to see. We will then install our Automatic Traffic Counters (ATCs), which are pneumatic tubes that we lay across the carriageway, and leave them in place to collect traffic data over a one-week period. Once the survey is complete, we analyse the results to give you a complete picture of the existing traffic conditions, including any potential speeding issues or areas that might need further review.
What you receive
We will provide a summary of the results in a spreadsheet format, including traffic volumes, vehicle types, vehicle speeds, and 85th percentile speeds for each direction of travel. Depending on local authority or highways requirements, we can use data from the Speed Survey to produce an accurate Visibility Splay assessment and drawing. Your design team can also use the results to inform the junction layout.
Our Visibility Splay services
What we offer
Visibility Splays are essential for ensuring safe access to and from your development, and supporting compliance with both national and local highway safety standards. They provide a clear measure of how far drivers need to see when pulling out of a junction to spot oncoming traffic in time.
We take the 85th percentile speeds from your Speed Survey and use them to calculate the stopping sight distance required at your junction. Next, we will plot the resulting sightlines onto your site layout and check whether they can be achieved, or whether any obstructions are in the way. If improvements are needed, we can provide expert recommendations for improving sight lines at junctions and access roads, mitigating any potential road safety risks.
What you receive
We will provide a Visibility Splay drawing in PDF and DWG formats that shows the sightlines required in each direction of the proposed access. This can be supported by a report and calculations that explain how each sightline was calculated from the results provided within a Speed Survey. You can then submit these as part of your planning application or use them to discharge a highways condition.
Case Study
Speed Survey and Visibility Splay for a new site access
A developer in Jefferyston needed to provide evidence that their proposed new junction would be safe for vehicles to enter and exit onto the main road. To support this, we carried out a Speed Survey to establish the 85th percentile speeds at which traffic was travelling along the road.
Using the survey results, we then produced a Visibility Splay drawing illustrating the required sightlines for drivers using the junction. The drawing provided recommendations and demonstrated that visibility was available in both directions. Together, the Speed Survey and Visibility Splay drawing provided supporting technical evidence to help the developer demonstrate that the proposed junction could operate safely.
I have worked with Tyler on a couple of projects recently and have been very impressed with the service provided to date. In an industry which typically needs information “yesterday” he has always met the tight deadlines promised with competence and diligence. On this basis we will continue to work closely with Encon and look forward to forging our relationship further with them on other future projects.
We partner with organisations like yours
Additional services
We offer a wide array of specialist services that complement our Traffic Survey services and are designed to boost your project’s overall sustainability rating.
From Daylight Calculations and Tree Surveys to SBEM Calculations and Acoustic Reports, our team provides the technical expertise you need to achieve the highest sustainability rating possible.
Want to gain environmental credits or need planning advice for your next project?
Call: 0115 987 55 99 or email:
Frequently asked questions about Traffic Surveys and Visibility Splays
Call: 01159 875 599 or email: