Abstract: A lawn mower includes a frame, an operator support, a blade assembly, a steering system, a motor assembly, a sensor and one or more processors. The operator support is coupled to the frame and is configured to support the entire weight of an operator of the lawn mower during use thereof. The motor assembly is configured to: drive rotatable wheels so as to move the frame along the ground surface; and drive at least one blade relative to the ground surface to cut grass. The sensor is configured to detect the presence of a person or an animal in a predetermined area proximate the lawn mower. The one or more processors are configured to: receive input from the sensor, and control the motor assembly stop driving the at least one blade, the wheels, or both based on the input from the sensor.