View the UCSD network's current traffic levels, including traffic along various cross-campus segments, at http://weathermap.ucsd.edu/. You must be using UCSD's wired or wireless network, or the VPN, to connect to this page.
The color of a pipe indicates the current percentage of usage of 10 Gigabits of bandwidth along that pathway. (Even if the pipe is 20G or 30G, the percentage will show as if it were a 10G pipe.)