carpool
US /ˈkɑːrˌpuːl/
UK /ˈkɑːrˌpuːl/

1.
an arrangement among a group of people to travel together in one car, sharing the cost and often taking turns driving
:
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We decided to carpool to work to save on gas.
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The company encourages employees to carpool.
1.
an arrangement where several people travel together in one car, especially to work or school, sharing the costs
:
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My daily carpool saves me a lot of money.
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They organized a carpool for the kids' soccer practice.