Subscribe | UPI Odd Newsletter Subscribe CONROE, Texas, June 17 (UPI) -- Authorities investigating an 18-wheeler abandoned on the side of a Texas road with the engine running discovered about 300 pounds of marijuana inside. The Montgomery County Sheriff's Office said deputies arrived at the truck, which was at the side of U.S. 59 near FM 1314, early Wednesday morning and found it was abandoned with the engine running, the Houston Chronicle reported Thursday. Advertisement The marijuana was discovered in the cab of the vehicle, deputies said. They said they do not know what happened to the driver or how long the truck had been at the side of the road. Read More Police: Man smoked pot in drive-through Arrests in raid on Michigan pot farm Pot bust nets $5 million in plants Man sentenced for pot cookie incident $4.5 million in pot seized in L.A. County