Visibility Splay Calculations Based on Measured Speeds
We utilise speed survey data to calculate precise visibility requirements, ensuring that sightless are safe, achievable, and justified by evidence rather than generic assumptions.
Surveys to Support Access Design and Planning
Speed Surveys, Traffic Data Collection & Visibility Splay Justification
Speed Surveys
Accurate traffic data is the foundation of any robust highway design or transport submission.
At Road Safety Audits Ltd, we undertake comprehensive speed surveys and traffic data collection across the UK to provide the empirical evidence required for access design and planning approvals.
By capturing real-world vehicle speeds and volumes, we move beyond generic assumptions to provide the Highway Authority with precise, site-specific data that can justify visibility requirements and demonstrate scheme safety.
Whether supporting a small residential access or a large-scale commercial development, our data collection services ensure your project is built on a foundation of technical accuracy.
“Accurate speed data removes the guesswork from highway design, providing the empirical justification necessary to satisfy planning authorities and ensure long-term road safety.”
— Tim Robinson, Road Safety Audits Ltd
Visibility Splay Calculations Based on Measured Speeds
We utilise speed survey data to calculate precise visibility requirements, ensuring that sightless are safe, achievable, and justified by evidence rather than generic assumptions.
Service Features
We utilise industry-standard monitoring equipment and analytical techniques to deliver a detailed picture of local traffic conditions and vehicle behavior.
We deploy pneumatic tube counters to record continuous, 24-hour data over a full week, providing a comprehensive overview of daily and hourly traffic volumes and speed trends.
Our team calculates the speed at or below which 85% of vehicles travel, providing the standard metric used by highway authorities to determine safe visibility splay distances.
We distil raw traffic data into clear, concise technical reports that are ready for immediate submission as part of your planning application.