The road measures 27.61 miles long and would take a car obeying speed limits 41 minutes to travel its length.
The A858 is a A Road and is located in the Zone 8 Highways Region.
This is a true long-distance route, journeying through numerous towns like Leurbost, Achmore, Lochganvich, Garynahine, Callanish, Breasclete, Tolstachaolais, Carloway, Kirvick, Upper Carloway, South Shawbost, North Shawbost, New Shawbost, Shawbost, South Bragar, Bragar, North Bragar, Arnol, Brue, Barvas, and Lower Barvas.
The road is located entirely within Western Isles.