The vehicle was a company truck with Healthy Stuff bakery signage, and without checking his blindspot or indicating intent with a turn signal swerved from the middle lane into the right lane. There wasn't enough space to get over between cars already in the right lane, and I had to hit the brakes to prevent be hit or being run off the road. This happened at the 3E exit on 581 North in Roanoke. Thanks HLTY STF, as a heads up you need to pay attention.