Pictures you didn't take

[xoxoxoBruce]

You don't need bridges to bring people unless you have buildings for them to live and work in. The higher the buildings the more people you need.

[glatt]

Originally Posted by xoxoxoBruce

The higher the buildings the more people you need.

You have that backwards. When you have lots of people, you need bigger buildings.

[xoxoxoBruce]

No no, people aren't standing in the street waiting for the building to be finished so they'll have some place to work/live.
If it's a company putting up a building for their firm, they always build bigger than they need hoping the business will grow and require more people.
The rest of the buildings are built by real estate speculators to rent space out. 99% of all cities have a surplus of unrented space. You know, vacancies, not built to demand, but in hopes of future demand.
If there is future business expansion, they might even have to build a bridge to accommodate those increases. That would be facilitating those increases not creating them.