Hi Timofey, Yes this is a second conditional question. I could answer: i would have to continue to a roundabout and come back along the road to the turning from the other direction. James

It is the second conditional, with the "then" clause as a question. It is correct, although you need a comma before the main clause (i.e., before “what”). Also, in proper American English, we still use “were” in all persons for the 2nd conditional — this is the subjunctive mood. Nowadays, you’ll also hear “was" in colloquial speech. In British English, they almost never use the subjunctive now.

I don't think it's second conditional, because it's a question. Second conditional should have a condition [If you needed to turn left while driving a car but it was forbidden] and a result. But that lacks here.