icon of Safety initiativesSafety initiatives

01. Maintenance & safety measures for the Metropolitan Expressway

Maintenance of the Metropolitan Expressway

We strive to give the customers a safe driving experience on the Metropolitan Expressway by undertaking detailed "inspections", "repair and reinforcement" of damaged parts, "cleaning" of road surface and road facilities, "emergency response" to road surface damage and fallen objects, and "snow and ice countermeasures" in winter.

Inspection

In order to tackle problems before the structure becomes damaged or decrepit, we focus on conducting daily inspections such as taking patrols on the road to check the road visually and with other senses, and also inspect structures such as the overpasses and tunnels by using aerial work platforms or temporary scaffoldings.

Expressway patrol inspection

Expressway patrol inspection

Walking inspection under the overpass

Walking inspection under the overpass

Close inspection of overpass using aerial work platform

Close inspection of overpass using aerial work platform

Close inspection by using temporary scaffolding

Close inspection by using temporary scaffolding

Close inspection inside tunnel by using aerial work platform

Close inspection on temporary scaffoldings

Walking inspection on the expressway

Walking inspection on the expressway

Repair and reinforcement

Various repairs and reinforcements are essential to maintain the road facilities. We not only repair the damage found during inspections, but also undertake reinforcement work to maintain the structure. When undertaking these works we take due care that commuting is not hampered by ensuring measures such as performing the work at night when the traffic is low.

Refinishing of the coating
Deterioration of steel bridge coating
Deterioration of steel bridge coating
Steel bridge coating
Steel bridge coating
Reinforcement of concrete floor slabs
Damage to concrete floor slabs
Damage to concrete floor slabs
Reinforcement by using carbon fiber sheets
Reinforcement by using carbon fiber sheets
Repairing pavements
Ruts and cracks
Ruts and cracks
Repairing by repaving
Repairing by repaving
Reinforcement of expansion joints
Damaged rubber expansion joints/Damaged steel expansion joints
Damaged rubber expansion joints
Damaged steel expansion joints
Repair by replacement
Repair by replacement
Repair works under long-term lane closure
Joint elimination work
Joint elimination work

In repair works under long-term lane closures, we have been working towards eliminating joints to reduce the number of joints on the road surface in order to improve durability and driving comfort.

Measures to prevent noise barrier from falling
Measures to prevent noise barrier from falling by installing wire ropes
Measures to prevent noise barrier from falling by installing wire ropes

In centralized construction, we are implementing no-joint construction to reduce the number of joints on the road surface in order to improve durability and improve comfort for running.

Measures to prevent fatigue damage

Steel structures in harsh conditions such as increased traffic volume of large vehicles are prone to fatigue damage. We are actively working on the measures to prevent fatigue damage of steel structures on the Metropolitan Expressway, adopting visual inspection and non-destructive inspection to discover and repair problems before the structure collapses completely. We ensure the safety of the Metropolitan Expressway.

Image of measures against fatigue damage
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Cleaning

We clean the road surfaces and road facilities to improve driving safety and convenience. Several thousand tons of garbage and soil are collected every year. Even one empty can left on the road can cause serious accidents. Therefore, all roads are cleaned. We also clean up facilities and equipment like tunnels and parking areas.

Cleaning of the tunnel wall/Cleaning of road surface
Cleaning of the tunnel wall
Cleaning of road surface

Emergency response

We operate on a 24-hour system for emergency situations such as road surface damage found in routine checks, facility damage due to traffic accidents, and natural disasters.

Emergency response
Emergency response

Snow and ice countermeasures

In order to ensure safe traffic in winter, the period between December 1 and March 31 has been allocated for undertaking snow and ice countermeasures. In order to prevent accidents caused by freezing of road surface, deicer is scattered as needed. In addition, we remove snow on the road to prevent traffic closures.

Scattering of deicer
Scattering of deicer

Efficient maintenance by i-DREAMs®

We utilize the state-of-the-art smart infrastructure system "i-DREAMs®" to implement advanced and efficient maintenance management. "i-DREAMs®" aims to estimate the deterioration within structures by utilizing a damage estimation AI engine, and to automatically detect repair and reinforcement candidates according to the degree of damage.

High Level, Effective Maintenance and Management is Achieved by the New Smart Infrastructure Management System.
Overview of Intelligence-Dynamic Revolution for Asset Management Systems