Carpooling (also car-sharing, ride-sharing, lift-sharing and covoiturage), is the sharing of car journeys so that more than one person travels in a car.
By having more people using one vehicle, carpooling reduces each person's travel costs such as fuel costs, tolls, and the stress of driving.
Carpooling is also a more environmentally friendly and sustainable way to travel as sharing journeys reduces carbon emissions, traffic congestionon the roads, and the need for parking spaces. Authorities often encourage carpooling, especially during periods of high pollution or high fuel prices.
Source: Wikipedia https://en.wikipedia.org/wiki/Carpool