Trucks are more likely to roll than skid when travelling too quickly through a curve/corner (unlike cars). That’s why changes in superelevation (i.e. crossfall) within an intersection can have big impacts on vehicle stability.
In general, the crossfall adopted for turning roadways where vehicles can turn at moderate speed should desirably not exceed +7% or -3%. For a turn executed at very slow speed (say < 10 km/h), the desirable maximum adverse crossfall (i.e. the vector sum) is -5%.
The diagram in this video shows how a 3% crossfall and a 3% longitudinal fall can combine to result in a 4.2% adverse crossfall throughout a right turn.
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