NOTE 1 Assuming bQ taken as aq in accordance with 4.3.3. The value of 0q may be increased to a maximum of (1/oq1) by agreement with the relevant authority, if single axle loads up to 450 kN are to be considered, or to a lower value (but not less than aQmin of this NAD) if specifically agreed with the relevant authority. (Each contact surface of the single wheel load corresponds to that of twin wheels.)
NOTE 2 The gap shall be applied around each part of the vehicle pairs as shown in Figure 4.5 of ENV 1991-3:1995.
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