|
|
|
|
|
|
|
|
|
|
|
Site Design by WebSelect Internet
All safety cameras sites are selected with the aim of reducing speed-related collisions and casualties.
Each site is selected using strict criteria based on the number of speed-related collisions and casualties over the last three years. This criteria was set to ensure that cameras will only be placed at locations where they will have a positive effect on speed-related collisions and casualties.
| Rule | Fixed Speed Camera Sites | Mobile Speed Camera Sites | Red Light Camera Sites |
| 1. Site Length Requirements | Between 400-1500 metres10 | Between 400-5000 metres | 50 metres |
| 2. Number of fatal and serious collisions (KSI) | At least 4 KSI collisions per km in the baseline period11. For information, the partnership should provide the total number of PIC collisions | At least 2 KSI collisions per km in the baseline period11. For information, the partnership should provide the total number of PIC collisions | At least 2 KSI collisions within the junction in the baseline period11. For information, the partnership should provide the total number of PIC collisions |
| 3. 85th percentile speed at proposed sites | Speed survey shows free-flow 85th percentile speed12 is at or above ACPO threshold13 | Not applicable | |
| 4. Percentage over the speed limit | At least 20% of drivers are exceeding the speed limit13, excluding congestion periods | Not applicable | |
| 5. Site conditions that are suitable for the type of enforcement proposed | Loading and unloading the camera can take place safely | Location for mobile enforcement is easily accessible and there is space for enforcement to take place in a visible, legal and safe manner | Loading and unloading the camera can take place safely |
| 6. No other engineering solutions can be implemented | There has been a site survey carried out by a qualified road safety engineer confirming that no other cost effective engineering solution can be implemented to improve road safety along this stretch of road. | ||
10 Sites using time over distance equipment may extend beyond this length.
11 The "baseline period" is a 36 month period, the start date of which must be consistent with the start of a programme quarter (i.e. 1st april, July, October or January) and the end date must be within twelve months of the date of operational case submission.
12 The 85th percentile speed is the speed at which 85% of traffic on the road was travelling at, or below, when the survey took place.
13 the 85th percentile speed, ACPO threshold and speed limit can all apply to either all vehicles or the class of vehicle but must be compared consistently.
The first step of the selection process is to ascertain the number of speed-related collisions and casualties that have occurred at the proposed location. This is done using a collision and casualty database that is maintained using actual police records of collisions and casualties. This system enables our team to analyse all the collisions and casualties along a chosen route.
The second step in the process, unless the site is for a proposed red light camera, is to conduct a speed survey using speed data collection equipment. This equipment is deployed for five days at a time and records information on every vehicle in relation to:
This data is then downloaded onto a computer for analysis. The information will be used to ascertain if there is an actual speeding problem.
The third and final step of the process is to have the site surveyed by a qualified road safety engineer. This will determine the suitability of the site for the operation of safety cameras. Traffic calming measures such as speed humps and chicanes will always be considered in the first instance. Safety cameras are only operated as a last resort.
When this information has been collected and analysed our team can then decide which type of safety camera enforcement, if any, is appropriate.