Cut off their food supply and it will take longer but the effect on their moral would be greater.
Try 48 to 72 hours. Study how JIT (Just-In-Time) delivery works. Matter of fact the American Trucking Association put out a publication in July 2006 with a lot of detail. You should be able to find it as a PDF file on the internet, titled as "When Trucks Stop, America Stops". It was kind of a shock to me some years ago to see that all the food many people will have in their home is what they bought
that day and nothing else, and it's pretty widespread.
A 100 lbs. Of roofing nails would slow them down.
The ones that don’t get stuck in your tires get flipped up for the next truck.
Shit, we have a rainstorm and traffic crawls, accidents backup traffic until nighttime