‘[it] is a single carriageway road with one lane in each direction and it is subject to the national speed limit which means 60mph for both vehicles involved in this incident. The general layout can be seen in the photographs and it is similar when approaching from either direction with kerbs, grass verges and hedges bordering farmland. The opposing lanes are separated by double solid white lines. …There are chevron boards on the outside of the bend indicating the direction but not the severity of the bend. When heading north, as the motorcyclist did in this case, the road initially follows a gentle right-hand curve and then ascends to a crest. From the crest the road descends slightly into a sharp left-hand bend. Vision towards this bend and around it is limited firstly by the crest and then by the hedge line. When heading south, as the car did, the road ascends gradually towards what is for the driver a right-hand bend. There is a more open view on the approach to the bend as there is no crest at this point. Drivers travelling in this direction have better views around the bend as vehicles are on the outside of the curve.’
‘[the car] had sustained shallow, longitudinal damage. There was no frontal impact damage. There was scuffing to the offside front wheel and damage that extended from the offside front wheel. It continued back along the offside as far as the rear wing. There was an obvious impact to the windscreen, the ‘A’ and ‘B’ pillars. All of the damage was consistent with having been caused by the motorcycle and its rider, in an upright position. The…motorcycle had scuffing and impact related damage that was confined to its offside. There was scuffing and damage to the front tyre and the alloy wheel rim had shattered on the offside. There was further scuffing and damage to the fork, fairing, fuel tank, radiator cover, pedal controls and the exhaust. The offside (right) handlebar with an integrated indicator and the brake lever had been damaged. The height of this…handlebar would be consistent with the damage to the ‘A’ and ‘B’ pillar of the [car]. On examining the road I found a fresh tyre scuff mark on the solid white line alongside the southbound lane (that being the line closer to the [car]. Beyond the initial tyre scuff mark was a thinner tyre mark alongside which was a scuff mark. Beyond this point, along the white line adjacent to the northbound lane was another tyre mark and within the southbound lane was a series of scratches and gouges. All led in a straight line heading generally north and leading to an area of fluid from the motorcycle. Adjacent to this fluid spill and closer to the southbound kerb was an area of body fluid. There was shattered glass from the [car] scattered along the southbound lane, beyond the initial tyre marks.’
‘I was driving towards Buckingham. I was going around that bend as the motorcyclist was coming the other way. It looked like they came over to my side of the road and crashed into me.’
‘Stated he was riding towards Towcester and approached left hand bend. A car came round the bend and he recalls its wheel being over the white line (centre). He lifted the m/c up and collided with it.’
‘…the average accuracy of the GPS receiver in the black box is typically 2.5m (as taken from GPS chipset manufacturers specifications) under good signal conditions and once it has had time to settle and is not accelerating.’
‘CEP is a standard term which stands for Circular Error Probability. 2.5m CEP means that when the GPS receiver has a good antenna installation and an unobstructed view of the sky, you can draw a circle of radius 2.5m (i.e. a diameter of 5m) around the GPS receiver and there is a 50% chance that the reported GPS position will be in that circle.’
‘…it is the primary factual evidence which is of the greatest importance in a case of this kind. The expert evidence comprises a useful way in which that factual evidence, and the inferences to be drawn from it, can be tested. It is, however, very important to ensure that the expert evidence is not elevated into a fixed framework, against which the defendant’s actions are then to be rigidly judged with a mathematical formula.’