They are close enough, there's enough exhaust to breathe along with beery yelling breath without being any closer. It's been known that motos can get in the way at times when it's tight. Italy is the maddest place for this, too many motos on races, at least TdF restrict the numbers of press/radio/TV bikes.
The runners are the worst, if you have one trip over in front of you, down you go. Love the fans, hate the running fools. Some of the motos have a little unofficial contest to see who can whack most nitwits, you don't see it on TV but some of the Gendarmerie can be very useful with the boot!