Thirteen kilometers through Gunma's mountain scenery where aggression costs more than it gains. Tsubaki Line flows smoothly — wide corners, good sight lines, clean asphalt — which tempts drivers to push harder than they should. But the length is the trap. Thirteen kilometers is long enough that a single mistake compounds, and recovering lost time means maintaining unsustainable pace for the remaining distance.

Tsubaki rewards consistency. Not the fastest single corner, but the ability to string together thirteen kilometers of smooth, efficient driving without a single moment where you overcook an entry or miss an apex. Cars that maintain composure over long distances dominate. High-strung setups that excel in short bursts fade. This is about sustainable pace, not peak attack.

Character: Flowing mountain road with medium-speed corners and scenic sections. Requires pacing strategy and mechanical reliability. Cars with good cooling, consistent handling, and comfortable ergonomics excel. Track-focused setups that sacrifice comfort for peak performance struggle with the distance.