Spray and being in a group of four or more seems to be a popular precaution:

"One of the most popular hiking and biking trails in Banff National Park is bringing in restrictions at the height of the summer tourist season due to fears of bear attacks. Until Sept. 15, it will be mandatory for hikers to travel in groups of at least four. At least one of the individuals will be required to carry bear spray."

http://mobile.thestar.com/mobile/canada/article/1031709