death car on the freeway 1979 torrent

A woman is badly shaken when she is run off the freeway and nearly killed by a crazy van-driver. Her story is not taken too seriously by TV or the police - until another woman is killed in similar circumstances, also by a dark van. The police seem to have no leads, so a TV reporter starts investigating the similarities between the cases. As the deaths mount, she takes hazard-driving lessons. When she finally locates the driver's whereabouts, he's missing, but chases her onto the freeway...