In message
-sept
ember.org, at 08:27:00 on Mon, 25 Apr 2016, Recliner
remarked:

The transport authority instead estimates that the development, which could
lead to heavier congestion on London's roads, buses and trains, will have a
£18.4bn price tag.

Is that figure net or gross of the fares the extra passengers will be
paying?

It's a capital cost, not an operating cost. And most road users don't pay
fares.

But how much of the £18bn is new roads, let alone ones TfL will be
responsible for?

Even many bus users don't pay fares (ie, they have bus passes).

That's only a small part of the bus traffic at Heathrow. And remember
HEx is paying for itself (both capital investment and operating costs).
--
Roland Perry