The road measures 119.33 miles long and would take a car obeying speed limits 2 hours and 43 minutes to travel its length.
The A12 is a A Road and is located in the Zone 1 Highways Region.
This is a true long-distance route, journeying through numerous towns like Poplar, Aberfeldy Village, Bow, Homerton, Stratford, Leyton, Leytonstone, ILFORD, ROMFORD, BRENTWOOD, Pilgrims Hatch, Shenfield, Mountnessing, INGATESTONE, Margaretting, Galleywood, West Hanningfield, Great Baddow, Howe Green, Sandon, Springfield, CHELMSFORD, Boreham, Hatfield Peverel, WITHAM, Rivenhall, Kelvedon, Inworth, Feering, Marks Tey, Copford, Stanway, COLCHESTER, West Bergholt, Great Horkesley, Mile End, Colchester Business Park, Ardleigh, Dedham, Langham, Stratford St. Mary, Great Wenham, Capel St. Mary, Copdock, Foxhall, Brightwell, Martlesham Heath, Martlesham, Little Bealings, WOODBRIDGE, Hasketon, Melton, Bredfield, Ufford, Pettistree, Wickham Market, Lower Hacheston, Marlesford, Little Glemham, Stratford St. Andrew, Farnham, Snape, Benhall, SAXMUNDHAM, Carlton, Kelsale, Yoxford, Darsham, Thorington, Blythburgh, Henham, Bulcamp, Wangford, Frostenden, Wrentham, Benacre, Kessingland, Gisleham, Carlton Colville, and LOWESTOFT.
The road passes through several counties, including Greater London, Essex, and Suffolk.