AMBULANCE Victoria has praised emergency services that attended a car crash on the Western Highway south-east of Horsham on Wednesday morning. A Horsham man, 18, was airlifted to a Melbourne hospital after his car hit a tree near Green Lake. He is in The Alfred hospital with serious injuries. Horsham police and paramedics, Country Fire Authority crews from Green Lake and Jung and State Emergency Service units from Horsham and Stawell attended the scene. Ambulance Victoria Wimmera region group officer Nick Thresher said he was impressed with how well the SES, CFA, VicRoads and police worked together. "It was a difficult scene to attend - it was very muddy terrain," he said. "All the services worked together in a very straight-forward manner. "All the volunteers were sensational." Horsham Senior Constable Dennis Foster said the incident happened about 1.30am. "It was a single vehicle accident and there was only one occupant in the vehicle," he said. "His car left the road and struck a tree." Senior Constable Foster said the driver was cut from the vehicle and airlifted to The Alfred. He said a passing motorist found the accident. The car was severely damaged. "We are still waiting to hear more from the hospital at this stage," Senior Constable Foster said. "The cause of the accident is unknown because we haven't been able to speak to the driver. "The investigation is continuing." Mr Thresher said the highway was closed to allow the air ambulance helicopter to land. "VicRoads were very efficient at directing traffic," he said. "The pilot had limited space to land because there were power lines on the south side of the highway and trees on the north side.''