I made the text go away by doing this:
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Open the FollowSplineComponent blueprint in the blueprint editor.
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Make sure you are viewing the Event Graph.
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At the Sequence Node which is directly after the Event Begin Play node, right-click on “Then 1” and find “Break link to…”
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Under “Break Link To…” click “Break link to Branch”
When you’re done, it should look like it does in this screenshot:
You might be able to make the cars stop shaking by setting the Forward Aim Distance in their FollowSplineComponent to something between 500 and 1500. That way, the car will be directing itself toward the spline at a point on the road ahead of the car (like a real driver would) instead of at a point directly beneath the car and the steering should be smoother, if I understand the blueprint correctly.
Also, to get the cars to stop, see if you have a keyframe to make them brake and also a keyframe to make the speed zero when you want them to stop moving. When I tried making a car stop in my project, just setting a keyframe to make the car brake didn’t stop the car; I also had to set a keyframe to make the speed zero.