In the days before Hurricane Irma made landfall in Florida, the state ordered 6.3 million people to leave their homes. As people in the rest of the nation watched videos and photos of bumper-to-bumper northbound traffic on Interstates 75 and 95, while the southbound lanes were nearly empty, most had one of two reactions. Some said, “If only Florida had large-scale passenger train service that could move those people out,” while others asked, “Why aren’t people allowed to drive north on the empty southbound lanes?”
The aftermath of the storm has already opened a debate over what Florida should do to increase its resilience in the future: build more roads or build more rail lines. The right answer is neither: instead, state transportation departments in Florida and elsewhere need to develop emergency plans to make better use of the transportation resources they already have.
Rail advocates like to claim that rail lines have much higher capacities for moving people than roads, but that’s simply not true. After the San Francisco earthquake of 1906, the Southern Pacific Railroad moved 300,000 people–free of charge–out of the city in what was probably the largest mass transportation evacuation in American history. While impressive, it took the railroad five days to move all of those people on three different routes. Even accounting for improvements in rail capacities in the last century, moving 6 million people out of south Florida by rail would take weeks, not the four days available between Florida’s first evacuation orders and the arrival of Hurricane Irma.
At the same time, the state of Florida could have done more to relieve congestion on major evacuation routes. The most it did was to allow vehicles to use the left shoulder lanes on part of I-75 and part of I-4 (which isn’t even a north-south route), but not, so far as I can tell, on I-95. What the state should have done, since there was very little southbound traffic, was to open up all but one of the southbound lanes of I-75 and I-75 to northbound traffic.