A good rule of thumb for drivers sharing the road with a truck is:

Always try to stay alongside a truck, but never drive right behind it.
If you can’t see the truck driver in their side mirror, they can’t see you.
To tailgate closely to benefit from their aerodynamic draft.
It is better to drive to the immediate right of the cab.
Explanation

Passenger vehicle drivers often underestimate the limited visibility of truck drivers due to blind spots (or "No Zones") around their vehicles. Despite having a better forward view and larger mirrors, trucks still have areas where smaller vehicles can go unnoticed. When sharing the road with a truck, know that if you cannot see the truck driver in their side mirror, they likely cannot see you.

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