The Dodge Charger R/T is a functional concept car developed in 1999 by American automobile manufacturer Chrysler. It took many styling cues from the 1960s Chargers (most notably the second generation) but unlike the original, had four doors. The designers attempted to blend the rear doors into the design so they would not be noticed very easily. The decision to add four doors was made due to the declining sport coupe market in North America. Compressed natural gas was purported as being in the lineup for a possible fuel source.