During a practice session, the Koenigsegg One:1 smashed the Guinness World Record time for a 0-300-0 kilometer per hour run that was set by its predecessor, the Koenigsegg Agera R.

The previous record held by the Agera R had the vehicle achieve the feat in 21.19 seconds back in September 2011. The One:1 was much faster, posting a new record of 17.95 seconds to reach 300 kph from a standstill then back to a complete stop.

The One:1 was 3.24 seconds faster than the time posted by the Agera R, a time that was already widely considered to be an unbeatable record.

The record run was among a series of practice runs held at a company testing track in Sweden on the evening of June 8, with Koenigsegg factory test driver Robert Serwanski behind the wheel.

The data for the record run was acquired by the VBox data recorder, showing that the One:1 needed 11.922 seconds to reach 300 kph from a standstill then another 6.032 seconds from that speed back to a complete stop. It should also be noted that the vehicle was able to post faster times for the acceleration and deceleration stage on separate runs. Taking together the best acceleration time and the best deceleration time, the theoretical best time of the One:1 stands at 17.49 seconds.

It should also be noted that the development car driven in the practice run is heavier by 50 kilograms compared to customer cars, as there is a roll cage installed in the One:1 for safety reasons to protect the test driver.

"We think that an even lower time is a distinct possibility with the Koenigsegg One:1 and we will do our best to schedule another session in the near future," the company said, setting up another attempt to take the record time down even further.

According to Koenigsegg, the 0-300-0 run tests the car's technical and mechanical capabilities. The accompanying video of the test run also shows that Serwanski actually goes beyond 300 kph, reaching 340 kph before applying the brakes. Part of the reason is to allow the vehicle to reach a speed of 200 mph, which is another measurement being taken for the vehicle, and also to make sure that the full pressure of the vehicle's brakes have been applied once the car has decelerated to 300 kph.

You would think that such a blazing fast time is already awesome enough, but what makes the story much more amazing is that Serwanski actually keeps his hands off the steering wheel for most of the time, showcasing the ability of the One:1 to maintain its speed and stability.