The trishaws each have an electric-assist option that the pilot is trained to use. The system uses a “Pedal Assist Sensor” that applies power only as you pedal (assuming the pilot chooses to use the pedal assist mode). The power assist level can be varied from no assist through several levels of assist (depending on the model), through a controller on the handlebars. Power assist is cut when you stop pedaling or when your speed reaches 15 miles per hour.