Original sentence: In order to relieve traffic volume during the morning and evening rush hours, high-occupancy vehicle (HOV) lanes were built in many major cities to encourage carpooling and greater use of public transport.It also entails no need for a formal or informal arrangement before-hand, with ride-sharing occuring on an ad-hoc basis.This created a situation that made a form of hitch-hiking between strangers that was beneficial to both parties - the driver gets to use the HOV lane for a quicker journey to work, and the passengers get a free or cheaper method of travel to work compared to other modes.This presented a disadvantage for car drivers who could not or would not switch travel modes, and who were unable to join formal ride-sharing schemes or could informally ride-share with aquaintances/friends/family
Edited sentence: In order to relieve traffic volume during the morning and evening rush hours, high-occupancy vehicle (HOV) lanes were built in many major cities to encourage carpooling and ride-sharing.Relying instead upon slugging benefits everyone, since the sluggers get a free ride in and out of the city, the drivers gain free access to the less-congested HOV lanes, the traffic load is reduced due to the higher frequency of carpooling, and the environment benefits by having fewer cars on the road idling in stop-and-go traffic.This creates a situation in which drivers wish to use the HOV lanes but either don't know any co-workers who live nearby, or do not want to get involved in a formal ride-sharing agreement requiring multiple people to coordinate work schedules