When is it lawful to drive with only one hand on the steering wheel?

Driving with only one hand on the steering wheel is lawful in specific situations where it is necessary for vehicle operation. Shifting gears in a manual vehicle requires one hand to be temporarily removed from the wheel, allowing the driver to effectively manage the gear lever. This action is essential for the safe operation of a manual transmission, as it ensures that the vehicle can shift properly to maintain performance and control.

In contrast, using a GPS device or receiving a phone call typically requires more attention to the device rather than focusing on driving, which could pose safety risks. Similarly, engaging in a casual conversation with passengers might distract the driver, hence it is advisable to keep both hands on the wheel for maximum control of the vehicle. Therefore, the situation of shifting gears is the only context in which it is appropriate and lawful to briefly operate a vehicle with one hand on the steering wheel.