It could almost be the punchline to a joke - but works on a major trunk road to turn it into a dual carriageway really are being held up by a slow-moving report on snails. Councillors on Norfolk ...

Black ice is a very thin layer of ice that can develop on wet roads after the passage of rain. As temperatures drop, the wet surfaces can freeze up, causing dangerous conditions on the roadway.

The device warns riders if vehicles are in their blind spots or behind them, and shows their relative distance. A rearview camera in not included in the system. For rider notifications ...