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The A52 is a major east-west road in the East Midlands. It runs east from a junction with the A53 at Newcastle-under-Lyme near Stoke-on-Trent (just east of the M6) to the Lincolnshire coast at Mablethorpe. Running for approximately 147 miles, its route passes via Ashbourne, Derby, Stapleford, Nottingham, West Bridgford, Bingham, Grantham, Boston and Skegness.

A line of roads or tracks known as the 'Salt Way' (or 'Saltway', 'Salter's Way') can be traced for about 40 miles across the north-east part of Leicestershire into Lincolnshire. The identifiable route (who knows its western and eastern limits?) essentially corresponds with Roman roads, Margary numbers RR58a and RR58b. (Ref. 'Roman Roads in Britain', Vol. 1, by Ivan D. Margary).
RR58a started at the River Soar (Barrow upon Soar); crossed the Fosse Way (RR5f, modern A46) at Six Hills; ran along the Belvoir escarpment and Leicestershire Wolds; crossed the River Witham at Saltersford (SK 927 334), which may be the site of the Roman settlement of 'Causennae'; before joining Ermine Street (RR2c, modern B6403) near Cold Harbour.
From Ermine Steet RR58b, also known as 'Salt Way' ran along, or close to the line of the modern A52 into the Fens at Donington. Fuller details and references at Link

The Bridge End Causeway (aka Holland Causeway) was a medieval route across the fens from Bridge End (near Horbling) to Donington, a distance of over 3 miles. It probably followed an earlier route (possibly the Roman 'Salt Way'), and now forms part of the A52. Link