Transportation

Carsharing
Sharing the whole car

ride-sharing
Sharing just the ride

There are websites to organize ride-sharing where people often also share the expenses for the rides - or some even try to make money from passengers.

Rides may be with personal cars or also with group tickets for public transportation...

hitchhiking

 * Hitchwiki has much information on hitchhiking

Stigmergic Hiking

Verkehr