The “permitted trucks” refers to trucks that are not normally legal (oversize, overweight or carrying especially hazardous materials) and which require special permits to travel on public roads. These (and only these) types of trucks are forbidden – probably due to the steepness of the hill, or a tight corner at the bottom which could result in a stuck truck, unable to extricate itself which would block the road.
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Ottorino Respighi
http://www.norwalkriver.org/
The “permitted trucks” refers to trucks that are not normally legal (oversize, overweight or carrying especially hazardous materials) and which require special permits to travel on public roads. These (and only these) types of trucks are forbidden – probably due to the steepness of the hill, or a tight corner at the bottom which could result in a stuck truck, unable to extricate itself which would block the road.