Sounds like either the National Driver Register or NHTSA is single-homed to Verizon, or the state DMVs each have a WAN circuit of some sort through Verizon to where the National Driver Register system physically lives. If it's the latter, it sounds like a job that could be handled much more effectively using site-to-site VPN tunnels, but I understand the realities of being stuck in a long-term contract, policy mandates that dictate a physical connection, or things along those lines. Government agencies can and sometimes do get funding for infrastructure upgrades and resiliency - at least if they budget for it...
I'm sure the backstory here is both mundane and interesting.
Thank you
jms