A lane down the centre of the road carries a solid yellow line on the outside and a broken yellow line on the inside. What is this lane for?

Why C is correct

This is a shared left-turn lane, and its layout is the message: a broken line facing each direction of travel, with a solid yellow boundary along each outer edge, tells you the lane belongs to oncoming traffic quite as much as to you. Either direction may enter it, but only to begin a left turn, and only for a limited distance before the turn itself. Using it to overtake, to slip into moving traffic, or simply to drive along is both unlawful and genuinely startling to everyone else, because nobody expects a vehicle approaching head-on inside a lane they were themselves about to enter.

Why the other options are wrong

A. A reversible through lane whose direction depends on the hour

Reversible lanes use overhead signals and distinct markings because their direction genuinely changes. This one never changes direction; both directions may occupy it at once.

B. High-occupancy vehicles during peak hours

High-occupancy lanes carry diamond markings and their own signage, and they sit separated from general traffic rather than exposed down the middle of it. Disambiguation matters here because this lane is open to everybody in both directions at once. Any lane restricted to particular vehicles would say so explicitly.

D. Emergency vehicles making their way along the centre of the road

Emergency vehicles get no dedicated centre lane anywhere. Nothing reserves a lane for them in advance; when a responding vehicle needs room it uses whatever lane the incident calls for, generally relying on other drivers moving aside rather than on permanent provision having been made for it.

On the road

A driver uses the centre lane to get past somebody slow and meets the car coming the other way to turn left. Neither thought they were doing anything unusual, which is exactly the assumption the design cannot survive. Both were entitled to be in that lane for their own manoeuvre and neither expected anyone else there. Shared means shared.

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