Signal controlling and transiting scheme of crossroad

The invention provides a signal controlling and transiting scheme of a crossroad. According to the scheme, a middle isolation zone adjacent to the crossroad is removed or the middle isolation zone is not arranged to form an opening for enabling left-turning vehicles to enter the outer side of an opposite traffic lane; a left-turning lane is marked from the opening to the outer side of the opposite traffic lane by using a traffic mark; more than two vehicle parking places are marked on the outer side of the opposite traffic lane; the vehicles on forbidding road sections of the crossroad cannot go straightly, turn left and turn right; the straightly-going vehicles and the right-turning vehicles on passable road sections of the crossroad cannot drive before being released and are managed by traffic lights; a left-turning traffic light guides the vehicles to drive into the outer side of the opposite traffic lane and turn left in sequence; after the guiding of the left-turning traffic light is finished, the straightly-going vehicles and the right-turning vehicles on the passable road sections of the crossroad are guided to pass through by the traffic lights. According to the signal controlling and transiting scheme of the crossroad, the middle isolation zone is not arranged on one part adjacent to the crossroad, so that the passing-through time of the straightly-going vehicles is shortened effectively under the precondition of shortening the passing-through time of the left-turning vehicles greatly; therefore, the aims that the left-turning vehicles and the straightly-going vehicles drive on respective lanes and do not mutually obstruct driving are realized.