 There is a steep descent of Nantgwynant and some 1¾ miles of this is on a substandard, narrow twisting alignment, where larger vehicles have difficulty in passing.There are further substandard sections in the Aberglaslyn Pass and towards Tremadog and coaches have had difficulty passing in this section.The road passes through Beddgelert by way of a sharp right angled bend over a river bridge, not recommended for articulated vehicles.