b) Width: Maximum width is 2,5 m.

c) Height:

- Not higher than 4,2 m for double-deck vehicles;

- Not higher than 4,0 m for other vehicles.

In addition, if gross vehicle mass does not exceed 5 tonne, vehicle height, other than projection of antenna or equipment of similar structure that does not affect stability of special-use automobiles as defined under the TCVN 6211 shall satisfy the requirement below:

H_max ≤ 1,75 W_T

 Where:

H_max: Maximum permissible height of the vehicle (Figure 1);

W_T: Spacing between contact points created by two rear wheels and road surface if the rear axle consists of single-tyre wheels (Figure 1a) or Spacing between center contact points created by each rear wheel set and road surface if the rear axle consists of dual-tyre wheels (Figure 1b).

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- Not exceeding 65% of wheelbase (L_cs) in case of passenger vehicles (wheelbase of articulated bus is calculated for the first section).

- Not exceeding 60% of wheelbase (Lcs) in case of trucks.

Where: Wheelbase (L_cs) is the distance from the ROH line to the center of the center of the frontmost axles; Identification of ROH line shall conform to the following principles:

- If rear axle is single axle, the ROH line shall cross the center of the axle;

- If a vehicle consists of two rear axles or a tandem group axle where both axles have similar tyre number, the ROH line shall cross the middle point of both axles; where one axle consists of twice as many tyres as the other axle, the ROH line shall cross the point located at two-thirds (2/3) of the distance from the center of axle with fewer tyres to the center of axle with more tyres;

- If a vehicle consists of tri-axle groups, the ROH line shall cross the middle of 2 centers of the rear most axles;

- If rear axle groups consist of steering axles, self-steering axles, lift axles in combination with other axles (non-steering axles), only non-steering axles shall be taken into account for the purpose of identifying ROH line.

For the purpose of identifying wheelbase (L_cs), ROH line of specific circumstances can be referred from Schedule 2 and Figure 2 below.

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e) Ground clearance: Not lower than 120 mm (except for special-use vehicles). In respect of vehicles where adjustment of ground clearance is possible, ground clearance shall be measured at the highest position.

Figure 2 - Illustrations of methods for identifying wheelbase (L_cs) and rear overhang (ROH)

Schedule 2 - Some cases in identifying ROH

No.

Rules for identifying ROH

Illustration

1

If a vehicle only consists of one rear axle, the ROH line shall cross the center of the axle

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