Resiliently expandable cautionary structure

Retractable safety marker

Road buoy

Road warning emergency system and method of utilizing same

Roadway marker

Roadway markers with concave curved edges

Rocking road emergency warning sign

Safety marker

Safety triangle

Self righting road marker

Self righting traffic cone

Self-righting traffic marker

Self-stable, portable, foldable, easily assembled road warning s

Sign assembly having a pivoting flag

Signal device

Signaling device

Soft sandwich board system and method

Stackable road delineator

Stackable vertical panel traffic channelizing device

Stiffener core for a highway marker