Somewhere South Of Midnight by Stephen Laws
Harry Stark and his family are driving down the motorway on the first night of their holiday. They're heading south to the port where they'll catch a ferry. Harry checks his watch. It's just after midnight. The motorway is suddenly flooded with light. A blinding, intense, painful light. There's a terrible multiple pile-up. Carnage. Harry's wife and daughters are dead. But somehow Harry himself and a handful of others escape from the scene with scarcely a scratch . . .