A Tesla Roadster is 300 mph capability.

The immediate answer is "no." The Tesla Roadster's top speed is roughly 250 miles per hour.  

The car isn't capable of moving any quicker due to safety and engineering constraints.

The 200kWh battery pack, two electric motors, and four wheel independent suspension of the

Tesla Roadster are built for successful handling on roadways rather than high-speed acceleration.  

Other vehicles with top speeds of more than 300 mph are available on the market, but they don't have the extended range, performance, and utility of a Tesla Roadster.

The top speed of a Tesla Roadster is ultimately still far higher than the majority of areas' speed restrictions,  

providing enough of power for thrill seekers without going beyond the vehicle's design boundaries.