Select "ride with a friend" during a ride

To be able to “ride with a followed friend” is a great feature, but it would be great that during a ride (in some conditions) you would be able to activate this feature, so that (like in the real world) you meet a friend riding you can select to ride with him/her (so that if you have not selected the same route, you have not to ask in every turn).
Some conditions may be that both riders are close riding in the same segment, even if you cross to him (this autmatic feature would made the u turn), but not force to be close together… only to automatic select same turns as him.