|Location Map ( geo)|
|Distance:||16.2 miles (26.1 km)|
|Meets:||B4413, B4412, A497, A499|
|Route outline (key)|
The B4417 runs along the northern coast of the Lleyn Peninsula in western Caernarfonshire.
The road starts at Pen-y-groeslon (called Four Crosses in the 1922 Road Lists) and heads north. There is a sharp right-hand bend half a mile later on the edge of Llangwnnadl, which the road goes past rather than through. The B4417 then skirts Mynydd Cefnamwlch, with the sea clearly visible (in good weather) below to the left. It then zigzags downhill to Tudweiliog before crossing the coastal plain. The next village is Groesffordd and then the road enters Morfa Nefyn, where it crosses the B4412.
At Nefyn, under a mile later, the B4417 reaches a mini-roundabout where the A497 starts, moving off to the right along the original route of the B4416. This was the 1922 eastern end of the B4417 but with the coming of the A497 in 1935 the B-road was extended further along the coast along a previously unclassified road. Our road therefore turns left at the mini-roundabout to pass along the narrow strip between the hills and the sea.
Over a mile later the B4417 climbs and turns inland. It goes through Pistyll before zigzagging through the valleys in the vicinity of Moel Ty-gwyn and Moel Gwynus. After passing through Llithfaen (with its speed bumps) it reaches a height of over 800 feet on the edge of Yr Eifl before descending steeply once again to the village of Llanaelhaearn. Originally the road turned right in the centre of the village to pass the church and end on the A499. However, it now continues straight to end on the A-road at a roundabout on the far side of the village.