For front tandem axle vehicles, (1) the link rod may interfere with the tyre when the vehicle goes over a bump while the steering wheel is turned to the max, due to its unsuitable shape. If this problem is left unattended, in the worst case, the rod could break, making accurate steering impossible. (2) The brake pipe may interfere with the tyre when the vehicle goes over a bump while the steering wheel is turned to the max, due to its unsuitable shape. If this problem is left unattended, in the worst case, the pipe could be damaged, allowing air to leak, which could result in reduced braking efficiency.