On an expressway where traffic is light and flowing smoothly, a car driver drove slower than the minimum speed to enjoy the scenery. Which statement about this is correct?

1. ①The minimum speed is only a recommendation, so this is not a violation.
2. ②There is no unavoidable reason such as congestion, so it is a violation of the minimum speed.
3. ③As long as the car stays in the outermost lane, it may go slower than the minimum speed.
4. ④Turning on the hazard lights allows the car to go slower than the minimum speed.