Yes, but in global_cfg are general limitations for roads that do not have specified limitation (sign) depending on road type, and also depending on vehicle type.

For example Austria:
Code:
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Last four values in 'speedlimits_x' are corresponding to groups in first four fields (for specified vehicles) and overriding those values.
I only don't understand value '3500' for 'Trucks'.

P.S.

'3500' could be total weight (in kilograms) of vehicle from which it belongs in this category.