making your presence well known ahead of time by being noisy can help, but it doesnt always, and thats when you can have a 3/4 ton animal suddenly bolting at you from thick bush in about 2 seconds, because its decided to lay in ambush to kill or wound you rather than give ground.

and really the moose are a lot more likely than bears to go after you.

more qualifiers as well such as with calf or cubs, hunting and predation engagement being interrupted ect.