Just before 10 pm an attempt to locate was put out on an 18-wheeler southbound on I-69 at the Montgomery/Liberty County line. It was reported the driver was unable to maintain lanes. A short time later a Splendora Officer spotted the vehicle and after following it a short distance attempted to stop the truck. With her emergency equipment activated the driver continued southbound. He was finally stopped at FM 1485 as other units assisted. The driver was determined to be intoxicated. His truck was towed to impound.