FAQ - Traffic & Safety

Traffic information

Traffic rules

  • Q1
    Can two people ride on a motorcycle on the Metropolitan Expressway?

    The ban on two people riding a motorcycle on highways was lifted in April 2005, but the Tokyo Metropolitan Public Safety Commission decided to prohibit it in some sections centered on the Inner Circular Route of the Metropolitan Expressway. This was done based on the studies of safety on the Metropolitan Expressway which found that there were spots prone to accidents such as sharp curves, and spots in which many accidents had occurred in the past.

    The Metropolitan Expressway was built to maximize the use of limited public space such as small/medium waterways in existing urban areas as well as the airspace and ground beneath ordinary roads, so we believe restrictions on winding roads are unavoidable. Therefore, we are taking safety measures using various methods in cooperation with relevant authorities, such as installing alert boards before curves, displaying diagram-based road shapes, and displaying messages such as "Caution Curve" or "Slow Down".
    We will continue to implement safety measures such as laying drainage pavement to stabilize mobility, installing large caution signs that draw attention to curved sections, installing curve alert zebra boards, and strive to prevent motorcycle accidents by conducting public relations efforts and awareness activities on safe driving by means of campaigns, distributing leaflets to promote safe driving, putting up posters and homepage information. So we sincerely ask for your understanding.
    Our site currently provides accident spots and accident circumstances concerning motorcycles, so please have a look.

Safety and traffic jam measures

  • Q1
    What efforts are you engaged in to reduce traffic jams?

    Along with the full opening of the Central Circular Route in March of 2015, traffic jam was relieved mainly at the merging section of the Inner Circular Route and the inbound Radial Line inside the Central Circular Route, but traffic jam still forms in the Central Circular Route and its surroundings.
    For details, see Initiatives to Alleviating Congestion.

  • Q2
    What efforts are you engaged in for traffic safety?

    Rear-end accidents, vehicle collision accidents, and collisions with Metropolitan Expressway infrastructure occur on the Metropolitan Expressway. We are analyzing these accidents, and implementing safety measures based on the results. Specifically speaking, there are caution signs for rear-end accidents and vehicle collision accidents, as well as colored caution pavement for infrastructure collisions.
    For details, see safety initiatives.

  • Q3
    What measures are taken during tunnel fires?

    We monitor traffic conditions and facilities 24 hours a day in preparation for a potential tunnel fire. We track fire information from fire detectors and tunnel conditions from television cameras, and remotely control each device quickly and accurately.
    If you encounter a tunnel fire, please report it using an emergency telephone, push button report device, or the road emergency number "#9910" from a mobile phone. If possible, please try to initially extinguish the fire with fire extinguishers and foam hydrants installed in the tunnel after you have confirmed that you are safe. Also, emergency exits are installed at intervals of 250 m or less for evacuating rapidly to a safe space.
    *If you call the road emergency number, support will be provided in Japanese.

In the unlikely event