Fastest speed on a public highway (closed road)

According to Official Guinness Records,

The highest speed ever reached on a public highway during a legal racing event is 392.2 km/h (243.7 mph), by Jim Peruto (USA), during the 2012 Nevada Open Road Challenge, on Route 318, Nevada, USA, on 20 May 2012.This speed is Peruto's speed recorded through the final speed trap of the course, his average speed over the 145 km (90 mile) course was 350.12 km/h (217.55 mph). This average speed is even more impressive because it has been achieved from a standing start.

For a complete list of 2012 records, please visit 2012 Guinness Records in United States.

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