I have been taught that when meeting another hiker on a trail who is going the opposite direction, the one going uphill has the right of way. Those rules were made before trail running became so popular. Last week, my wife and I did a rim to rim to rim hike in the Grand Canyon. At least 30% of the hikers we met on the trail were doing rim to rim to rim in one day runs. When possible, we stepped off the trail to let the runners pass, but several times under the traditional rules we should have had the right of way. Who has the right of way, the hiker going up hill or the trail runner?