Just before 8 pm Montgomery County 911 started getting multiple calls reporting a Honda passenger vehicle had slammed into the rear of an 18-wheeler. North Montgomery County Fire Department arrived on the scene to find a 29-year-old female in the front seat of a vehicle that had suffered massive damage. The female, who was not entrapped was transported to Conroe Regional Medical Center in critical condition. She was pronounced deceased on arrival. DPS Troopers investigating the crash determined an 18-wheeler had broken down and was parked on the shoulder of the road. The truck was loaded with plastic mats used in the construction industry for heavy equipment to travel on. The driver placed reflective triangles in the road as required by law. For unknown reasons the vehicle left the main lanes, struck all the reflective markers then slammed into the rear of the 18-wheeler. I-45 was shut down for several hours as the investigation continued. Milstead Wrecker Service responded to the scene . With the extensive damage to the trailer a dolly was required. Once it was in place the trailer ad to be backed up almost 3 miles on the freeway for them to safely get it off. Another truck loaded the tractor and yet another for the vehicle. The freeway was completely cleared by 2 am. The name of the victim has not yet been released pending notification of next of kin.