The Isaiah David Hart Bridge is a cantilever bridge that spans the St. Johns River in Jacksonville, Florida. It is named after Isaiah Hart, the founder of Jacksonville. The bridge has traditionally been painted green. The eastbound end of the bridge delivers drivers to downtown Jacksonville or Martin Luther King Expressway, while the westbound end sends motorists to Beach Boulevard. Daily traffic is 47,000 vehicles. The stretch of highway between downtown and Beach Blvd. is known as the Hart Bridge Expressway.