When choosing a relocator there are a number of factors to consider; one of those factors is the time it will take for the relocator to get to the neighborhood. For that reason you may see companies along or near a major thoroughfare relocate back and forth such as the Prospect Expy/Ocean Pkwy (279/131, 245/161, 254/153), Kings Hwy (276/156, 310/174, 283), and Atlantic Ave (224, 226, 227, 332/175 )
There is no hard and fast rule as to who goes but sometimes when you find a combination that works, you stick with it if you can.
There's more backstory here:
http://www.fdnewyork.com/article2.asp
P.S. Despite what some believe, a relocation counts as a run because it's an emergency that you're responding to -- a critical shortage of fire protection in an area. For that reason you should be going lights & siren, NOT on a 10-20 or after you finish the meal. Depending on the distance, time of day and traffic conditions, we fully expect you to be at least close to the area in a short amount of time.