Taxis
Taxis also serve a similar role to buses, supplementing the rail system, especially after midnight when most rail lines cease to operate. People moving around the city on business often chose taxis for convenience, as do people setting out in small groups.
As of December 2007, taxis cost ¥710 (~$7.89 at ¥90/$1 USD) for the first two kilometers, and ¥90 for every 288 meters thereafter, or approximately ¥312.5 per kilometer. Most companies tend to raise fares by 20% between 22:00-5:00, but other companies have kept fares low to compete in a crowded market.
Read more about this topic: Transport In Greater Tokyo