carpooling       
noun [ U ] uk/ˈkɑːˌpuː.lɪŋ/ us/ˈkɑːrˌpuː.lɪŋ/
 合用车,拼车
the activity of a group of people travelling together in a car, especially to work or school
  Carpooling saves on travel expenses. 拼车可以节省交通方面的费用。 
 We share carpooling duties. 我们分担拼车的责任。 
 See: carpool
 - More examples
- Carpooling with someone who is always late may not work so well.
- Carpooling declined nationally from 13 percent of car traffic to 11 percent.
- The high-occupancy-vehicle lanes on the highway are intended to encourage carpooling.