Armed officers loiter in front of public buildings, while brightly-clad police community support officers (PCSOs) patrol station concourses.
In addition to widespread renovations, LA's $1.3 billion is going to buy two new concourses and nine new gates to accommodate A380-sized planes.
"When you turn up, as we did over the Christmas period, and there's no toilet paper, blocked loos, the televisions don't work in the main concourses," says Stuart Rogers, chair of City's Supporters Club and Trust, "you have the feel of a club waiting to do something good but while it is waiting, a lot of the day-to-day running costs appear to have been pegged back.
During that time, fans in the stadium – which has no roof - were encouraged to get under the cover of the stands or into the concourses.
When England arrived with timetabled precision, 90 minutes before kick-off, the concourses were a dreamscape.
Chelsea's solution has been to increase that both by digging down, and by proposing to cover over two adjacent railway lines, using the new space for concourses.
In the concourses and carparks they hugged and whooped.
"We don't want to see anyone hurt at our stations so we'll be doing what we can to keep concourses dry and clean and signposting lifts clearly for those with heavy luggage".
Gates, arranged in long, boxy concourses set way out in the field, are linked to central terminals by underground trains.
Underhill's theories include the Invariant Right (Americans keep to the right side of concourses or sidewalks), the downshift period (they need time to slow down), the Decompression Zone (they don't notice the area inside the door of a store), the butt-brush (women brushed on the behind move away from a display), and "petting" (customers like to handle merchandise).
Beneath it run a series of tunnels and concourses connecting the various government buildings, and from January to June, when the Legislature is in session and the budget is in play, the political professionals take to the catacombs, a race of disingenuous horse-trading troglodytes haunting the fast-food pavilions.
