In the summer of 2010, The University of Michigan's solar car Infinium reached a top speed of 105 mph (~169 kph) during vehicle testing.
The University of Michigan's Momentum solar car has reached speeds of over 90 mph (~145 km/h).
AT present these cars are not street legal. It is unlikely, that they ever will be due to the available energy from the sun verses the weight to make the car legal.
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The fastest solar car in the world, the VBB-3, has reached speeds of over 300 mph. However, typical solar cars used in competitions and for regular transportation purposes usually have top speeds around 60-70 mph.
Earth
The fastest moving planet in our solar system is Mercury. It orbits the Sun at an average speed of about 47.87 km/s, covering roughly 107,000 km in an hour.
The Bugatti Chiron Super Sport 300+ is currently the fastest car to reach 60 mph, achieving it in under 2.4 seconds.
The fastest car with a manual transmission is the Porsche 911 GT3 RS, which has a top speed of around 193 mph.
The fastest car in the world in 1966 was the Lamborghini Miura. With a top speed of around 171 mph, it was considered one of the fastest production cars of its time.