Overall the path is basically flat with a drop of about 100 feet from high to low over the course of the path so I would term it as an easy run so to speak. I have seen many people run down 302 during the day so it is not uncommon to run this road but this path forces you to run off the side of the road and in some cases in the weeds. As an alternative, if you don't want to fight the 302 traffic (or hurdle through the weeds) is to take the short 302 route from the beginning of the run (wide open, easy to avoid traffic) and then do Attitash fields to the village and back to the fields or if you want to take the COW Hill Road run (posted yesterday), that would add .75 miles to this 4 mile jaunt (and make this path a very challenging one) which would allow you to avoid the someone tough parts of 302. That route is shown below.
Here is the Details
The 302 Route: 4.2 Miles
The 302 Route + Cow Hill Extension: 5 miles
Total Elevation High Low of 302: 600ft / 500 ft
Total Elevation High Low of the Extension: 1000 ft / 595ft
Easiest Path: Easiest of the options presented would to take the Attitash Fields and then reverse and head back down the Fields avoiding much of 302.
Hardest Path: Take the whole route with Cow Hill above but instead of going down to Attitash fields from the Seasons, turn up Cow Hill and basically reverse the path mentioned above.