A signaling device for defining a space between parked vehicles. The signaling device comprises a vehicle attachment component, an extendable component, and a warning component. The vehicle attachment component is configured to engage a vehicle window. The extendable component comprises rotatable and telescoping arms for defining the space between the vehicles when the rotatable and telescoping arms are extended. The warning component alerts others of the defined space. A method of using the signaling device to define a space between parked vehicles is also disclosed.