28 The sightlines at a grade crossing must meet the requirements of section 20 if
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(b) the class of track referred to in column 1 of the table to article 7.1.2 of the Grade Crossings Standards changes, taking into account the maximum allowable operating speed set out in column 2 or 3 of that table, as applicable;
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(d) an increase in the road crossing design speed results in a change to the specification set out in column B of Table 10-2 of the Grade Crossings Standards to which the road approach corresponds, taking into account the characteristics set out for rural roads in Table 10-3 of those Standards or the characteristics set out for urban roads in Table 10-4 of those Standards, as applicable.