When you minimize the chance of vehicles being in the area that you can't see, you reduce the chance of accidents. Since before I was born, trucks have had stickers on their trailers that say "passing side" with an arrow pointing to the driver's side, and "suicide" with an arrow pointing to the passenger side.
As a semi-truck driver, you spend most of your time in the right lane, on the same side of the shoulder of the highway where most people pull onto when their vehicles break down, or if they're pulled over for a traffic violation. Since trucks stay in the right lane, they must always be on the lookout for patrol cars and disabled vehicles on the shoulder. When a truck is approaching the obstacle on the shoulder it must either move over, slow down, or both. One of the most dangerous maneuvers a driver makes is merely moving from one lane to another.
To further complicate this lane change, there may be traffic and obstacles ahead that the traffic behind the truck can't see. Usually, when I'm moving over to avoid an upcoming hazard, there are vehicles speeding up from behind; they rarely want to wait for me to move into the left lane. They don't know why, or they don't care why, I'm moving over and slowing down.
Occasionally there's a cautious driver who recognizes what I'm attempting to do, and lets me have time to do what I need to. Since everyone is in such a hurry to get from point A to point B these days, it's rare to see cautious drivers on the road. I'll go into a rather lengthy post about that topic on another day.
Many times when I move into the left lane to avoid an obstacle or situation on the shoulder, hurried traffic simply maintains their speed, blowing by me on the right. This creates an even greater hazard, having a vehicle speeding in the right lane between an obstacle on the shoulder and a semi-truck in the left lane. The trick is to control your environment. You can't stop the people behind you, and you can't explain to them what you're seeing in front of you, but you can keep them guessing and leery of the big semi-truck in front of them.
As soon as you identify the hazard, you must look at the traffic behind you and around you. After you've done this, you must decide which action to take. Much of the time I just slow down, use my turn signal, and move over, but when I see vehicles behind me speeding up to pass on the right, I'll start to move back over into the right lane, straddling the center stripe until I pass the hazard. This keeps them in a safer place than if they were to try to squeeze by me. I then begin to move back into the right lane as soon as I have passed the hazard on the shoulder, leaving the vehicle behind me having to move into the left lane.
This strategy rarely fails and has resulted in safe passing of shoulder hazards time and again. And since it's worked for over a decade and a half now, I think I'm going to stick with it.
