The A893 is a trunk road connecting the A835 (which passes along the edge of the small Highland town of Ullapool) to the ferry port. The fact the road is trunk gives it unwarranted impressions of grandeur, as in fact it is around 400 yards long.
Ullapool - Ullapool Ferry
The A893 in Ullapool
Approaching Ullapool on the A835, you will pass the Shell petrol station on your right. (This is the only major filling point for many miles, and consequently you pay around an 8-9p supplement for your litre.) The A835 dives to the right to avoid most of Ullapool, although in reality you are already in the urban area. At this point, if you proceed straight ahead (which requires you to turn off) you will find yourself on the A893, otherwise known as Shore Street. Proceed for the next 400 yards or so, passing the Ferry Boat Inn and a number of tourist traps and snack bars on your right, then turn left into the small ferry port. You have reached the end of the road, although the ferry will take you to Stornoway.
Prior to the A835 being extended past Ullapool, that route ran along Shore Street to the pier. It was when it was extended around the coast to Ledmore that the A893 was created to form the important, if very short, link to the pier.