Final answer:
The middle lane of a three-lane roadway is typically the most constant in terms of speed due to factors such as merging traffic and congestion.
Step-by-step explanation:
The lane that offers the most constant speed on a three-lane roadway is the middle lane. This is because the middle lane is typically less affected by merging traffic and has a lower risk of congestion compared to the other lanes.
In addition, race car drivers often take the inside path (cutting the corner) whenever possible because it allows them to take the curve at the highest speed. This suggests that the middle lane, which is closer to the inside path, may offer a more consistent speed.