From Roader's Digest: The SABRE Wiki
|Length:||2.3 miles (3.7 km)|
|Route outline (key)|
The A1421 is a short link across the Cambridgeshire Fens.
The road starts in the centre of Haddenham as the continuation of an unclassified road which has priority over the A1123 which crosses it at a staggered crossroads. The road heads north and descends off the hill the village is built on. Unlike many fen roads, the A1421 is not completely flat and does not cross any significant drains. Presently the road starts to climb again and ends at a T-junction on the A142 to the south of Witcham.
The A1421 is one of the most renumbered stretches of road in the country. Originally numbered B1087, it was quickly upgraded to Class I status, becoming part of the A1072. In 1935 it became a spur of the new A1123 which it kept for over 40 years, eventually gaining its present number towards the end of the 20th century.