noun
long, straight, wide-open highway
A somewhat dated term for a modern, high-speed highway built for fast, uninterrupted travel; evokes the image of a bullet-like straight road.
戦後、各地に弾丸道路が建設された。
After the war, bullet roads were built in various regions.
高速道路 is the modern standard term for expressway or freeway, while 弾丸道路 is an older, more evocative term for a straight, high-speed road.
Compound of 弾丸 (bullet) and 道路 (road), literally 'bullet road', referring to a road designed for fast, straight travel like a bullet.