Hwy 401 eastbound just before Wesleyville Rd. exit (before Port Hope) on Thursday, June 23, 2016 at approximately 5:30pm. Dump truck (Francis Haulage) working on Aecon's jobsite enters live lane unsafely in front of my car. Driver's view was blocked by shuttle buggy (large white machine) therefore they should not have entered live lane at slow speed like they did, it would have been impossible for them to see me. Also my view of the dump truck was blocked by the same machine until just coming up to and passing it. When the dump truck pulled out I was forced to brake and change lanes to avoid a possible collision. I'm very lucky I wasn't a few seconds ahead of where I was and that no car was directly behind me or beside me so I could safely move into the right lane. The dump truck then proceeded to change lanes into the right lane after I passed it, then exit at Wesleyville Rd.