It sounds like many drivers are unable to get to the port to work, for the same reasons trucks aren't getting out. Lake of gas, damaged roads, etc. Also, if the driver's families are in dire straits, the drivers may feel they need to stay home and care for their families, protect their homes from looters etc etc. If it were a choice between reporting for work, or protecting your family, what would you do?

Another less obvious issue is that the current situation requires a big surge of trucking. Most of the island has been without supply for over a week now. Presumably Puerto Rico, like the most of the rest of the world, in normal times has goods supplied "just in time". What Russ buys in the store today was probably delivered yesterday or the day before. Now Puerto Rico suddenly has more than a week of supply backlog that must be moved from the ports. Even if every regular driver on the island was available, it might still not be enough for the current surge.

Not to derail the thread, but most people are totally unaware about what "just in time" really means for the stuff they consume. I went to a talk awhile back about planning for an earthquake disaster in Alaska. An emergency manager from Fairbanks said they estimate that at any given time, the stores in Fairbanks have on their shelves and in their storerooms about a one day supply of food for Fairbanks. The stuff Fairbanks will buy tomorrow is in the store today. The stuff for day after tomorrow is in trucks on the way from the port of Anchorage. And the stuff for the day after that is being unloaded in the port now. And the stuff for the day after that is on a ship somewhere between Tacoma and Anchorage. It is a marvelously efficient system when everything is working. But it is also a very fragile system. Something to think about.