I try to cross Greater London in a day without leaving a corridor 500 metres wide.
Unlike the open countryside (check out the channels below) a city is pretty much impossible to navigate linearly. Every conurbation will throw up its own challenges, but this seems to be approaching the lower bound for London.
Check out the follow-up video on how I computed the straightest line across London: https://youtu.be/qp0nRvkJP3w
My apologies go to Bromley Council for omitting your beautiful borough from the video chapters. Although I walked for over a mile along your border, I didn't actually cross it until the train journey home: http://www.planvu.co.uk/bromley/ Let it be known that the last 23 seconds was filmed in the London Borough of Bromley!
Other straight-liners you should check out:
@GeoWizard (the OG)
@marcusthechessteacher
@fieldhouseboys
Music:
Get A Move On - HookSounds: https://www.hooksounds.com/
On the Way - Vlad Gluschenko
Horses & Trains - Jesse Gallagher
New Day - Ikson
Mozart: Turkish March Improvisation - Fazil Say
Water Lily - The 126ers
Locations:
00:00 - Overview
00:58 - Hillingdon
03:24 - Harrow
10:06 - Brent
13:57 - Westminster
19:17 - Lambeth
21:37 - Southwark
25:16 - Lewisham
27:15 - Greenwich
31:37 - Bexley
38:01 - Back of Beyond...