According to Telford

• A. the size of stone at the centre varied from 160 mm to 200 mm and gradually decreased to 75 mm to 125 mm towards the haunches
• B. the central 6 metre width of the road was covered with two layers of stones about 100 mm and 50 mm respectively
• C. the size of stone used was of 63 mm diameter
• D. all of the above