The road measures 4.41 miles long and would take a car obeying speed limits 7 minutes to travel its length.
The B5123 is a B Road and is located in the Zone 5 Highways Region.
The road passes through several towns, including Halkyn, Pentre Halkyn, Rhosesmor, and Rhydymwyn.
The road is located entirely within Clwyd.