Abstract
Consequences on the rate of lane-change overtakings of an alternate driving discipline are explored. The new discipline consists of assigning vehicles to lanes according to their desired travel speed so that vehicles with speed in the same interval of the speed distribution travel normally in the same lane. It is shown that lane changing is minimized when the boundary between two adjacent speed intervals is their space mean speed. A simple behavioral rule to be followed by drivers which leads to the optimal assignment is formulated.