Some expressway entrances come in from the left; what problem does this create?

Some expressway entrances come in from the left; what problem does this create?

• A. The left lane is usually used for highest speed
• B. The left lanes have more exits
• C. The left entrance merge area is shorter
• D. The left lane is narrower

Answer: (A)

The situation tests how merging traffic interacts with where the high-speed lane is used. When entrances come in from the left, vehicles entering must merge into the leftmost lane, which is typically the fastest, most-traveled lane used for passing and maintaining high speeds. That means entering drivers have to time their merge into fast-moving traffic and often do so with limited space, creating sudden speed changes, weaving, and a higher risk of conflicts with vehicles already in that lane. The core idea is that left-side entry ramps disrupt the flow of the fast lane, making merging more dangerous. The other ideas—left lanes having more exits, being narrower, or the merge area being shorter—aren’t inherent results of left-side entrances and don’t explain the safety issue as clearly.

The situation tests how merging traffic interacts with where the high-speed lane is used. When entrances come in from the left, vehicles entering must merge into the leftmost lane, which is typically the fastest, most-traveled lane used for passing and maintaining high speeds. That means entering drivers have to time their merge into fast-moving traffic and often do so with limited space, creating sudden speed changes, weaving, and a higher risk of conflicts with vehicles already in that lane. The core idea is that left-side entry ramps disrupt the flow of the fast lane, making merging more dangerous. The other ideas—left lanes having more exits, being narrower, or the merge area being shorter—aren’t inherent results of left-side entrances and don’t explain the safety issue as clearly.