As a homeowner, you should reset the opener to prevent outsiders from opening the door with a remote that's set to a Liftmaster default code. A simple procedure allows you to reset the opener for one or more remotes.
doorsill - the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway. doorstep, threshold. 1  doorway, room access, door, threshold - the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; he stuck his head in the doorway.
From Wikipedia, the free encyclopedia. A Sig Alert is defined by the California Highway Patrol (CHP) as any unplanned event that causes the closing of one lane of traffic for 30 minutes or more. CalTrans uses the term SigAlert, and is defined as any traffic incident that will tie up two or more lanes of a freeway for two or more hours.