Illinois CDL Practice Exam.

Before merging onto a highway, it is essential for a driver to check their blind spots. This action is crucial because it helps ensure that the driver is aware of any vehicles that may be in adjacent lanes or in positions that are not visible through the mirrors. Merging onto a highway requires careful consideration of surrounding traffic to prevent collisions and to safely integrate into the flow of vehicles traveling at higher speeds. Checking blind spots allows the driver to identify any obstacles or other vehicles that may be situated in areas that cannot be easily seen. By taking the time to do this, the driver can make informed decisions about when and how to merge, thus enhancing safety for themselves and other road users. The other options do not promote safe merging practices. Rapidly changing lanes can create dangerous situations because it increases the likelihood of cutting off other vehicles. Using hand signals is generally unnecessary when merging onto a highway, as turning signals are more effective in communicating intentions to other drivers. Finally, speeding up without checking can lead to accidents, as it neglects the fundamental safety check of ensuring that the lane is clear before entering it.