"Cutting Corners" is a lesson in the London Crash Course. This is one of the trickiest lessons, as a minimum speed limit of 40 mph needs to be maintained at all times, meaning that if you drive below the speed limit for more than one second, it's game over. A similar challenge "Turn It Up!" appears in the San Francisco Crash Course (although it uses a 50 mph speed limit), and the 40 mph limit returns in London's Midterm 1.