I-80 is about the same as I-90 across new york,two very busy highways.my job requires me to run I-90 on a regular basis.in all the years i have been doing this i can count on one hand the number dead coyotes i have seen on that highway.there can be only two reasons for this,theres not that many coyotes there or it(the highway)becomes a territory line.across centrol new york i believe its a little of both.in your part of PA i'm not sure of the cercumstances but it may be the same way.they deffinetly don't like or want to cross busy toll roads.