Oklahoma State Trooper David Hamilton narrowly avoided a head-on collision with a semi-truck on a highway north of Ada, according to police. Dashcam video from the officer’s vehicle shows the semi-truck attempting to pass vehicles in front of it in a no-passing zone. Because the truck was blocked by other vehicles in the opposite lane, Hamilton was forced to swerved into the shoulder, escaping a potentially deadly crash.Police said the driver was cited for attempting to pass in an inappropriate zone.