Abstract: A clear sign rider. The novel clear sign rider is designed for attaching a secondary sign to a frame for holding a primary sign, and includes a sheet of transparent plastic folded over to form two parallel layers adapted to receive and hold the secondary sign therebetween, and a feature formed in the plastic for attaching the plastic to the frame. In an illustrative embodiment, the clear sign rider is adapted to be inserted in and fastened to a sign rider slot attached to the frame. At least one layer of the clear sign rider includes a hole for engaging a screw that attaches the layer to the slot. In a preferred embodiment, the clear sign rider also includes a circuit for wirelessly transmitting data to nearby mobile devices.