Abstract: A reflective device has a fluorescent sheet with reflective material, e.g. in the shape of strips, attached thereto, for mounting on a vehicle. The sheet has tabs extending from it for positioning in a closable aperture of the vehicle. The tabs may have rods to prevent the tabs from being pulled out of the aperture when closed. Tape strips may provide additional means of attachment. Tape loops and bungy strips provide means for fixing the sheet to lower portions of the vehicle. The sheet may be in the form of a hollow cylindrical tube. The reflective device may also be a sock which fits over a wing mirror, or a sheet with opposing edges that can be temporarily connected to form a sleeve which fits over parts of the vehicle.