I remember that incident. My sister-in-law had a motel in West Glacier less than 10 miles from where it happened. I cycled through the area in late August and visited with her. While I hadn't seen the specific "collide at high speed" report, what I found interesting is the victim had a lot of attributes that you would expect to be fairly familiar with bears
That area is known for bears. In 2003 I camped just up the road from the intersection of U.S. 2 and Going to the Sun Road prior to a backcountry tour in the park. The back of my site bordered a wooded area. Got out of my tent just before dawn to take a leak. Spooked something that thundered off. Way too heavy to be something like a deer.
Back in ‘99 I was riding in the general area when a local in a pickup truck stopped to ask us if we had bear spray because we were on the “main bear route.”