The picture below shows an interesting 'roundabout', some of you may even recognize it. There is a dual-carriageway running roughly vertically on the picture, traffic on the left moving up and traffic on the right moving down (although that should be obvious). Call the 'up' direction 'north' Traffic wishing to cross over the dual carriageway from the side road marked 'A' to the side road marked 'B', must join the north-bound carriageway at 'A', drive a 100 yds up the dual-carriageway, turn right into a short section crossing the central reservation, then turn onto the south-bound carriageway for 30 yds before turning off to their left. It's not technically a roundabout, although it would certainly seem like one to traffic approaching from any of the 3 roads at the bottom of the picture. Right of way, as indicated by road markings, is given to traffic going down from 'B' and traveling clockwise to go back up the dual-carriageway. Now to the accident. Driver A follows the blue line and waits at the junction where the red and blue lines meet. Driver A looks left, waiting for a gap in the busy traffic to join the down-bound carriageway. A gap appears, Driver A checks there is no traffic joining from the building across from the junction (rhs of picture) and pulls out. Driver A then senses something moving from his right, hits the brakes but not quick enough to avoid a car approaching from the right, that is, from the wrong direction for the carriageway. Driver B, unfamiliar with the area and using satnav for guidance, wishes to go North. The trees that can be seen filling the 'roundabout' obscure the other carriageway and it is easy to misinterpret the road section as a single carriageway. On arriving at the junction, the satnav enunciates 'turn right', so Driver B does so. Driver B then accelerates and belatedly realizes his error when Driver A hits him from the side and he works out that the approaching cars in the right-hand lane of the south-bound carriageway aren't just overtaking. Car A comes to an immediate halt. Car B swerves across the carriageway to the right then back to the left, before sliding onto the central reservation and skidding a further 30 yds along the grass (purple line). Car A is little affected (minor bumper damage) whilst Car B has considerable damage to the passenger side. Both drivers appear to be uninjured, although Driver B is suffering from slight shock. Driver A, who has a pre-existing neck injury, develops some whiplash-like symptoms as the day progresses. There are about 10 witnesses to the accident (cars traveling south), none of whom stop. A passing fire engine (not a witness) does stop and check if assistance is needed. A few questions: 1. To what extent is Driver A culpable for the accident? 2. Should the accident be reported to the Police: a. regardless of any symptoms Driver A may later develop? b. after Driver A developed symptoms. 3. Are witnessing drivers under any obligation (legal or moral) to stop, and at least check both parties were uninjured?