Police are investigating how a stolen flatbed semi trailer from Maple Ridge ended up blocking traffic in Langley. (Dan Ferguson/Langley Advance Times)Swipe or click to see morePolice are investigating how a stolen flatbed semi trailer from Maple Ridge ended up blocking traffic in Langley. (Dan Ferguson/Langley Advance Times)Swipe or click to see morePolice are investigating how a stolen flatbed semi trailer from Maple Ridge ended up blocking traffic in Langley. (Dan Ferguson/Langley Advance Times)Swipe or click to see morePolice are investigating how a stolen flatbed semi trailer from Maple Ridge ended up blocking traffic in Langley. Police are investigating how a semi trailer stolen from Maple Ridge ended up abandoned and blocking traffic in Langley early Sunday morning.