alternate route avoiding the leeds traffic.
go up the M66/A56 to M65, and up to Colne. then follow the A59 via Skipton and keep following that road to Harrogate/Knaresborough and onto the A1(M) well north of any traffic problems nearer Leeds.
Its a nice route over the pennines that. And fairly free flowing, used to take me about an hour to get from Bacup to Ilkley (turning off the A59 to go down the A65 for that) and about 1 1/2 hrs to go from Bacup to Harewood (roughly half way between Harrogate and Leeds) as a comparison its about 1hr 15mins to go Bacup to Harewood via M66/M62/A1(M)
As a comparison