A HORRIFYING five-vehicle accident on Sexton Hill on Saturday resulted in a man and a child being injured, wreckage strewn for 50 metres along the highway and traffic backed up for kilometres. Police said it was amazing no one was killed. The accident occurred just two days before NSW Roads Minister Eric Roozendaal is expected to visit the Tweed and announce the preferred design for the upgrade of Sexton Hill, regarded as one of the worst traffic black spots on the Pacific Highway in NSW. In Saturday's accident a northbound Ford sedan, driven by a 43-year-old father with an eight-year-old passenger, crossed to the southbound lanes as it headed north downthe hill towards Tweed Heads South shortly after 11am. In the resultant chaos a Mazda 4WD with a family of five on board flipped onto its roof and the small boat the vehicle was towing was sent flying metres across the road. A vehicle towing a golf buggy was also involved in the crash. Police said the driver of the Ford sedan suffered head and soft-tissue injuries and the child was treated for minor injuries and shock. Investigations into the cause of the crash are continuing. During his announcement of preferred options for Sexton Hill Mr Roozendaal is expected to also announce upgrades of Kirkwood Drive, with improved local traffic access to the Tweed bypass. He is understood to have received independent costing advice and Roads and Traffic Authority recommendations on a Banora Point residents' group proposal for a tunnel under the hill. The RTA has previously suggested a bridge across the valley adjacent to Sexton Hill, but this option has been rejected by the Tweed Heads Chamber of Commerce and some residents because it includes extra traffic lights on local roads.