On our list of safety camera locations, digital cameras are labelled as 'single directional' or 'bi directional':
- Bi directional - these operate in both directions, so they can check the speeds of approaching and receding vehicles at the same time. These are also known as simultaneous bi directional (SBD) cameras.
- Single directional - if casualty and collision data doesn't indicate a need for a bi directional camera, the camera will only check speeds in one direction (we'll tell you which direction). These are also known as uni directional (UD) cameras.