A traveling control method for performing a smoothing work or the like through an operation of a working device during traveling is provided. The traveling control method includes a first step of inputting a set value of a delay time of a traveling switching function of a traveling switching valve; a second step of inputting in real time an operation signal value according to a user's operation of a joystick and a traveling pedal; a third step of determining whether to operate the traveling and working devices according to the operation of the traveling pedal and the joystick; a fourth step of switching the traveling switching valve to a traveling switching mode through control of the electronic valve and returning to the second step when the traveling pedal and the joystick are simultaneously operated; a fifth step of determining whether the traveling pedal is operated and the operation of the joystick is temporarily stopped for a predetermined time; a sixth step of determining whether the set value of the delay time of the traveling switching function is larger than an initially set time required and switching the traveling switching valve to the traveling switching mode if the set value is relatively larger than the initially set time; and a seventh step of releasing the traveling switching mode of the traveling switching valve through control of the electronic valve and returning to the second step in the case where the traveling pedal is not initially operated, in the case where the traveling pedal is operated and the joystick operation has been stopped over the predetermined time, or in the case where the initially set time required is larger than the set value of the delay time.