B100/4B (Spooner Row – Snetterton – Browick – Spooner Row Circuit)
START at paint mark on road opposite street light No.24 on Spooner Row road. Proceed to Spooner Row roundabout where take 1st exit and join A11 westbound . Proceed via Attleborough roundabout to Snetterton inter junction and take sliproad and proceed to 1st roundabout (6.88 miles). Take 1st exit and proceed to 2nd roundabout, take 1st exit and proceed over bridge to 3rd roundabout. Take 1st exit and proceed via 4th roundabout to join A11 eastbound. Proceed via Attleborough roundabout to Browick interchange (signed Mulbarton). Take sliproad and proceed to 1st roundabout (18 miles). Take 3rd exit and proceed over bridge to 2nd roundabout, take 2nd exit to rejoin A11 westbound and proceed to complete first circuit at Spooner Road sliproad.
End of 1st circuit = 22.41 miles
End of 2nd circuit = 44.35 miles
End of 3rd circuit = 66.29 miles
End of 4th circuit = 88.23 miles
On completion of 4th circuit, proceed west to Snetterton interjunction, retrace over bridge and roundabouts. Rejoin A11 eastbound and proceed via Attleborough roundabout to FINISH at paint mark by drain at east end of sliproad from B1077 joining A11 at Attleborough (100 miles)