You share the Washington roadways with a variety of other vehicles. Whether you are watching out for motorcycles or traveling alongside a semi, there are risks when interacting with vehicles you do not understand. Of course, trucks pose a greater risk than a smaller vehicle. They also operate much differently than your car or passenger truck. Understanding where a semi's blind spots are located could help to keep you safer.
When you are in the blind spot of a semi, it means the driver cannot see you. He or she has no way to tell that you are there, and therefore, you are more susceptible to being hit or ran into. The Federal Motor Carrier Safety Administration explains that the blind spots for large trucks, such as semis, are quite expansive and likely take up more area than you would assume.
A good general rule of thumb is if you can see the driver in his or her side mirror, then he or she can see you. That is something to keep in mind. More specifically, though, the blind spots are 20 feet in front of the truck and 30 feet behind the truck. On the sides, you are at risk when you are on the right side for two lanes over and on the left, you are at risk when right beside the truck.
Your best bet is to always mak e eye contact with the driver when passing and to maintain good distances between you and the truck at all times. If you notice the truck is signaling to get over, do not attempt to pass. This information is for education and is not legal advice.