You can check traffic information and construction schedules for the Metropolitan Expressway in the following ways.
*The linked sites are only available in Japanese.

Real-time traffic information
Traffic information such as current traffic jams and accidents, road closures, and traffic restrictions are indicated on the Metropolitan Expressway's real time map. Furthermore, route and required time based on current traffic conditions can be searched by using the real-time route search. (See the homepage of the Japan Road Traffic Information Center for information on other highways such as the Tomei Expressway and Chuo Expressway.)

Construction schedule
"Traffic congestion expected" or "Involves road closures" due to construction plans and traffic restrictions on the Metropolitan Expressway are posted in the construction schedule and traffic restriction information. Construction schedules and traffic restrictions may change without prior notice.

Information based on past statistical data
When making travel plans, use route and toll guide, the traffic congestion forecast calendar with various congestion information, and the Monthly updates on avoiding traffic congestion before departure to make plans that avoid congestion prone times and locations as best as possible.
Check the current, real-time information (Metropolitan Expressway's real time map, etc.) and latest traffic information before leaving.

Traffic information at the destination
Please use a smartphone app capable of searching in real-time for the optimal route at that time.

You can check tolls, routes, and required times for the Metropolitan Expressway on the Metropolitan Expressway Drivers Site and the Shutoko Customer Center.
The required time may change based on the road conditions of the day you use the Metropolitan Expressway, so please check before departure.
*The linked sites are only available in Japanese.

Route And Toll Guide
You can search for tolls and routes for a specified travel time. Use required time information based on past statistical information together with videos of traveling the searched route.

Real-time route search
Use it for selecting routes that reflect current, real-time traffic conditions. Use this together with videos of traveling the searched route.

Shutoko Customer Center
The center provides answers to questions on required times, traffic jam conditions, and entrance closures for the Metropolitan Expressway with the latest information.

The information board provides current congestion conditions and required times. However, traffic conditions are continuously changing, so the conditions may change from when you viewed the information board to when you actually approach the zone displayed on the information board.
For example, if an unexpected scenario such as an accident occurs, traffic jams may rapidly spread. On the other hand, traffic jams may clear up immediately once an accident has been cleaned up.

Normally the time on a "required time display board" is displayed in orange, but the displayed time is changed to red if there is an accident or construction on the way to the location displayed by the "required time display board".
If the time is displayed in red, please be advised that the required time may suddenly change.

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.

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.

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.

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.

If you find fallen objects on the road, please notify us with an "emergency telephone" or the road emergency number(#9910).
Use of mobile phones while driving is prohibited by law. If you use the road emergency number from a mobile phone while driving on the Metropolitan Expressway, please report to us using a hands-free device or after stopping in a safe location such as a parking area of emergency bay.
*If you call the road emergency number, support will be provided in Japanese.

Please report it to the police if your car was damaged by an accident involving fallen objects or flying rocks.
Also, the source of the fallen object is liable for damages caused to the vehicle. Please be advised that we cannot provide compensation.
We regularly patrol and clean road surfaces to eliminate dangers, and we will immediately mobilize if you report fallen debris to us. Also, we cooperate with police to alert vehicles with loads at risk of falling.

If a large earthquake occurs when driving a car on the Metropolitan Expressway, the car jerks sideways like when a tire suddenly goes flat, and the steering wheel feels like it cannot be controlled. Please see measures during a large earthquake for more details.