Exactly what caused an Allegan County Sheriff’s deputy to lose control and crash on M-40 in Valley Township early Friday morning is under investigation. Extensive damage was done to the police car when it went into a ditch and hit several trees. The deputy was not hurt thanks to the airbags deploying and his seat belt. He was treated and released from a hospital, and the department is waiting to figure out just what happened before any action is taken. The crash happened just before 4 a.m.