A contractor¿s bulk tanker, Shell-branded, on its way back to Shell Gas Portugal¿s Matosinhos Depot, crashed into the rear of a heavy goods vehicle carrying scrap metal that was parked at the side of the road, partially obstructing the inner lane of the road. The road was straight with three lanes in each direction, with an additional section of road about 1.9 metres wide at the right hand side, where the HGV was parked. The road was in good condition. The day was sunny and clear, with good visibility. The driver was 34 years old with 11 years experience in dangerous goods transport. He had been working for Shell Gas Portugal since December 2003.