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faster
Theoretically, following the canal is 1 mile longer but takes about 5 minutes less. It has the advantage of being dead flat and avoids the absolute shit show of traffic jams involved in going up every west London high street which is what the Uxbridge Road involves. Even if it took slightly longer, it's still the way I'd go just for the reduction in NOx & PM2.5 inhalation.
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Personally I've always taken the train to Southall from Paddington. I've found the towpath down that way to be a frustrating ride and wouldn't attempt it on a road (race) bike - the surface is too inconsistent. It's OK when you don't actually need to be anywhere though. @Tenners
Appreciate at certain times of day this is forbidden however.
Is there a faster way to ride from Lisson Grove to Hillingdon Cycle Circuit than going down Sussex Gardens, and all the way along the Uxbridge Road?