Recently, the interest and operation of personal mobility (PM) have been actively conducted in Seoul. The PM penetration rate in Seoul is increasing by more than 30 % every year, and the number of PM-shared lenders is increasing every year. PM enables faster and greener movement in complex downtown Seoul. The survey showed that PM is 1.8 times faster than regular cars within 5 km of short-distance traffic in Seoul, and PM is eco-friendly because it does not emit smoke or exhaust gas compared to cars. PM, which has become a sustainable means of transportation, can now be easily seen throughout Seoul and can be used anytime and anywhere. If a PM collides with a car of comparable speed and size while driving on a road dedicated to cars, the risk of accidents is very high, and there is also a risk of a PM colliding with a pedestrian while driving on pedestrian roads. The government decided to investigate the effects of reducing the first two-way road by reorganizing the existing car road and establishing a new PM road. The Gangnam area, which has the highest traffic volume in Seoul, was set as an empirical research area, and its effectiveness was analysed. Many benefits, such as environmental benefits and reduced travel time, are expected if transportation is converted from cars to PM for short-distance transportation. It was analysed that the construction of PM-only roads resulted in environmental benefits of 6.6 x 109 KRW/y. Environmental benefits could also lead to active reviews of various roads that could trigger public transportation.