Final answer:
When driving on a four-lane freeway and needing to exit, one should change lanes one at a time to reach the exit lane, not crossing all lanes at once or reducing speed before lane changes.
Step-by-step explanation:
If you are driving in the left lane on a four-lane freeway and have to take the exit on the right, you should change one lane at a time to be in the exit lane. It's important to plan ahead and begin the lane change process early to ensure a smooth transition to the exit lane without disrupting the flow of traffic. You should not cross all lanes at once as it can cause accidents and is generally unsafe. Additionally, while changing lanes, maintain your speed consistent with the flow of traffic to avoid abrupt speed variations. Once you are safely in the exit lane, you can then reduce your speed following the posted exit ramp speed limit.