Our infrastructure has been exhaustively tested and designed to ensure that traffic from each one of our sites "considers" all possible outgoing routes - including routes through all the other sites, weighted for physical distance, reliability, performance and latency—and "selects" the most direct, lowest latency route available to the destination. That is, all the packets take the most direct and fastest way out, and have a full Border Gateway Protocol (BGP) selection of all the transit providers and peers available at all sites (not just the transit/peering lines present at that particular site).
This latest version of the Internet's routing protocol is a "path vector protocol," which has made the Internet a fully functional, decentralized system. The network is fully inter-connected and meshed. A good example of the design in operation is "Open Shortest Path First," (OSPF) for improved redundancy and speed.
