please empty your brain below

Interesting post.

Why do they not reuse the lowest number available when they start a new route? (Maybe apart from the really low ones like 10, which should be reserved for important routes)

Is there some sort of geographical sense behind the route numbers?
As you can see, they have started reusing the low numbers when starting a new route. Just not the very lowest.
To save others writing long screeds, here's an in-depth history of bus route numbering.
It's not done geographically any more.
What I meant is that they could keep a list of unused bus numbers, and whenever they needed one they could just pick the top one. It's how I'd have done it if I were TfL (which thank goodness I'm not)
I think it makes sense that they try to find numbers with some sort of relevance/significance/similarity rather than just grabbing the lowest one available. The only recent new route near me is the 301, and this shares some of its route with the 401, so I think choosing that number was a subtle way to give people a sense of it being the only other route to set off up the same road from Bexleyheath as the 401 does.
Spare numbers:

Below 100: four
100-199: none
200-299: one
300-399: fifteen
400-499: thirty-eight
They'd thought of using the 239 to append the 72 extras onto what's now the 218 (the 72 extras having become 265 extras and now part of the 419!)
X239 could be tweaked around Canary Wharf and Grove Park, There is no suggestion to create new route '239' from Greenford to Ruislip part of TFL. In 2008 These are simply outrageous lowest numbers for this being is that there is no 239 since last merge on Clapham Junction then gives 170 an extension further north. Via Whitton Avenue West, Alexandra Avenue, Eastcote Lane, Kings Road, Rayners Lane, Marsh Road, Bridge Street, Elm Park Road, Cuckoo Hill, High Road Eastcote, Field End Road, Elm Avenue, Park Way and Pembroke Road.
It will be confusing for X239 proposing new areas, While Route 200-299 has one spare TFL to give out '239' making it NW area route between Greenford Westway Cross and ruislip.

- Rayners Lane now gains a bus service with links to new areas

- No direct links










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