An itinerary of Lancashire at the end of the 17th century produced by the antiquarian Dr Richard Kuerden provides additional information to that contained in the drawings by the surveyors who produced road maps of this area of Lancashire some years earlier. The two sources are combined below.
This is a more detailed treatment of the longer section of the route from Standish to Preston.
From the Kuerden itinerary:
… passing the Lostoc Water at a fair Stone Bridge [Plimmers Bridge] parting Leyland from Blackburn Hundred you meet with the other road from Chorley to Preston (a), and on your left the antient seat of Walton of Little Walton [Dale Hall on plan, see introduction] but now belonging to Mr. Ratcliff Ashton son of Mr. Ashton of Cuerdale (b). About half a mile further is another road from Brindle to Preston (c), and shortly after you come to Walton, and leaving Walton Hall on the left (d), belonging to Sir Charles Houghton, you cross the Derwent [Darwen, Darren on map] at a large bridge, which is 20 yards between the springers; then enter Wall [Walton] Cop (e), for half a mile well rampyr’d with stone. At the end of the Cop you pass over a stone bridge (f), where the Scotch army was first routed, under Duke Hamilton, by Cromwell. Having passed this river, you leave Blackburn, and enter Amunderness Hundred, and the town of Fishwick. Passing on over Westfield Green (g), you enter the Liberties of Preston.
[The only other reference I have found to Westfield Green is in a quarter sessions record dated c1730, which refers to the widening of the road between Ribble Bridge and Westfield Green for the Preston to Wigan Turnpike (Lancashire Archives QSP/1318/1) .]
[For detailed plans of Preston at this period see here]
Having pass’d the Ribble Bridge to Preston where you leave the Alms House (h), and a transverse road from Lytham into Yorkshire (i), and another by way toward Broughton over the Moor (j) leaving the town of Preston on the left, you enter the town, and go through the Bars, leaving on the right a sumptuous House lately built by Tho. Patten now belonging to his son-in-law, Sir Thos. Stanley, Bart.
[Sir Thomas Stanley succeeded Thomas Patten on the latter’s death in 1697. This helps to date the Kuerden manuscript and gives an approximate date for the building of Patten House.]
Entering the Bars, and passing the Church gate street you leave the Church and School on the left, and many stately houses especially on the right, among others one built by Serjeant Rigby now the inheritance of his son and heir Thos. Rigby, late Mayor and Deputy-Lieutenant In Lanc.
[These Rigby references seem confused: Serjeant Rigby was Edward Rigby, whose son and heir was also Edward; the son and heir of Serjeant Rigby’s brother, Alexander, was a Thomas Rigby, but he was never mayor of Preston. The property mentioned was owned by Serjeant Rigby: see Upper Church Street plan.]
You pass by the Town Hall and Shambles on the right, and opposite to them is a foot road to the Boat at Penwortham [Main Sprit Weind], passing by the Cross and leaving on your left the Fishergate Street where many good houses are lately erected, and thro’ Cheapside, after which you enter the Friargate Street where near Friar Gate are many good houses especially one built by Sr. Christopher Greenfeld on the left. Having pass’d the Friar Gate Bars you shortly after come to the Moregate and the Common leaving on the left a fair house lately belonging to Mr. Alderman Laurence Wall, (k) following the causey over the Moor till you pass over the [Eaves] Brook (l) which parts the Liberties of the Borough you enter upon the Forest of Fulwood and over the Watling Street passing from Ribchester towards the Western seaports below Preston; then keeping on the left till you enter Cadely Moor (m) on the right you pass over the Say . . . [Savick Brook] (n) by a little Bridge.
The above extract from Kuerden’s itinerary is taken from a transcript that was published in Local Gleanings. 
 Local Gleanings Relating to Lancashire and Cheshire, vol. 1, 1876, 212, 217.