Embodiments of the present invention provide a traffic control method and an apparatus. The method includes: obtaining, by a server, a traffic flow of a road; adjusting, by the server, a lane quantity or a lane width of the road at a lane layer on a map according to the traffic flow of the road; and sending, by the server, a lane layer obtained after the adjustment, so that a vehicle running on the road runs according to a lane obtained after the adjustment. In the embodiments of the present invention, the traffic flow of the road is obtained, and the lane quantity or the lane width of the road is adjusted at the lane layer on the map according to the traffic flow of the road, so that the vehicle running on the road can run according to the lane obtained after the adjustment.