02/10/2026
Speed indicator device report for September 2026 Thurmans Lane Traffic
Throughout September, a traffic survey was carried out at the Thurmans Lane 'Speed Indicator Device' (SID) site to understand how people are driving and whether any changes are needed to keep the road safe for everyone. The SID monitors the speed of vehicles travelling from Trimley St Martin into Trimley St Mary.
What we found
Most drivers are sticking to the 30 MPH speed limit.
The typical speed (known as the "85th percentile") was 29 MPH, which shows good overall compliance.
The average speed across the month was 25 MPH.
Traffic levels were steady, with around 3,500 vehicles a day using the road.
The total number of vehicles recorded at Thurmans Lane in September 2026 was 104,980
When the road is busiest
Morning peak: around 8am
Evening peak: around 5pm These times match school runs, commuting, and general daily activity.
Although daytime driving is generally safe and well‑behaved, the survey did pick up higher speeds late at night and in the early hours of the morning, when the road is quiet. A few drivers were recorded travelling well above the limit, including one at 55 MPH (most likely 'blue lights') – but these incidents are rare.
Spriteshall Lane – September 2026 Traffic Summary.
Throughout September, a traffic survey was carried out at the Spriteshall Lane 'Speed Indicator Device' (SID) site to understand how people are driving and whether any changes are needed to keep the road safe for everyone. The SID monitors the speed of vehicles travelling from Walton into Trimley St Mary.
Overall Traffic Levels
A total of 133,644 vehicles travelled past the Spriteshall Lane SID during the month. This works out to around 4,454 vehicles per day, showing it is a consistently busy route.
Speeds
The speed limit is 30 mph.
The average speed was 26 mph, meaning most drivers were travelling safely.
The 85th percentile speed (the speed 85% of vehicles stayed below) was 29.8 mph, which is within the limit.
A small number of drivers exceeded the limit, mostly during quiet night‑time hours.
Peak Times
Traffic followed a typical daily pattern:
Morning peak: around 08:00, with roughly 343 vehicles
Afternoon peak: around 15:00, with roughly 420 vehicles
These peaks reflect school runs, commuting, and general daytime activity.
Speeding Behaviour
Most drivers were compliant, but speeding did occur:
Around 11–16% of vehicles exceeded the limit on a typical day
Night‑time hours (01:00–05:00) saw the highest speeding rates due to low traffic volumes
The highest recorded speed was 65 mph at 18:20 on 5 September (most likely 'blue lights').
Overall, Spriteshall Lane shows good daytime compliance with the speed limit and predictable traffic patterns.
Vehicle number summary
The total number of vehicles recorded at Thurmans Lane in September 2026 was 104,980.
The total number of vehicles recorded at Spriteshall Lane in September 2026 was 133,644.