noun, noun which may take the genitive case particle 'no'
highway to success; fast track to promotion
Metaphorical expression for a career path that leads to rapid advancement, often used in business or organizational contexts.
彼は出世街道をまっしぐらに進んでいる。
He is speeding along the highway to success.
あの部署は出世街道から外
That department is said to be off the fast track to promotion.