"Turtle Taxi" is a new taxi service where pushing a button on the back of the passenger seat activates slower driving than usual. During slow driving, a turtle mark is displayed on the windshield, from which people outside the car know that the car is driving slowly. Drivers have had special training, and provide not only slow driving but also a safer and more comfortable drive than usual for their passengers. Eco-driving is achieved by driving without sudden acceleration or sudden stopping, which contributes to the improvement of fuel efficiency and CO2 reduction. This service is popular among those who would like to move safely and comfortably and do not mind slower speeds such as the aged and pregnant women.