Just before 4 pm Sunday, a Lincoln Navigator with an adult male, an adult female, and two children ages 4 and 8 were traveling south on FM 1486 just before Caney Creek when for unknown reasons the Navigator crossed the center line and started heading toward the northbound ditch. At the same time, a Federal Express Step Van was traveling northbound on FM 1486. The vehicles hit the passenger side to passenger side. The two children were originally bound for the Texas Medical Center but the ambulances diverted to Hermann Woodlands where they were LifeFlighted to the Medical Center in very critical condition. Both remain in surgery. The adult female passenger was transported to Conroe in critical condition. The driver of the Navigator was transported in stable condition. The driver and passenger of the Federal Express truck were transported to Conroe in stable condition. The Federal Express truck is a contract truck from Bryan, Texas. It is believed the driver was not wearing his seatbelt his passenger in the one-seat truck was believed to be sitting on a pet food box. After the impact, the Navigator rolled over onto its roof and down a fifteen-foot embankment. A total of five ambulances from MCHD responded to the scene along with Montgomery Fire Department The road is expected to reopen close to 10 pm. The Montgomery County District Attorney’s Office Vehicular Crimes Unit is assisting DPS on the investigation.