Richard, I don't know how else to contact you, so delete this if you wish.but I just saw this on CycleUK (I don't post there) and wondered if I can offer any help (being in the US):
"c.t suffers from GIGO in British towns - Garbage In, Garbage Out. When
the infrastructure is rubbish then the routes are too. In the
Netherlands and Paris, for example, it has a much easier time!
(If it’s any consolation the situation is even worse in the US…)"
Comments
It’s an urban planning issue really! In much of US suburbia, housing developments follow a tree-and-branches structure with roads branching off each other and few entry points. There is very little permeability between developments, so you can’t avoid the main roads by cycling along residential roads as you might elsewhere. That means c.t can’t find a quiet route as easily as it might elsewhere.
True about urban areas, although anyone cycling in towns are risking their lives - 26 cyclist were killed on Houston roads last year - and should be advised against it - but country roads tend to meander (often called FM - farm to market) between towns and villages. Most minor ways off the main roads are gravel.
I would therefore suggest cycle.travel does not suggest routes through built-up areas but do so out in the sticks - as long as the sticks survive that is. There are few agricultural fields left within a 30 mile radius of Houston, for example.