creep along (something)
To move slowly, and often stealthily, across a particular area or surface. The robber crept along the walkway and then opened a window to get into the house. When I saw the bee creeping along the windowsill, I bolted out of the room.
creep along something
to move along something slowly and carefully; to sneak along something. Creep along the side of the building until you reach the door. The cat crept along the narrow kitchen counter.