• Traffic Signal Management

  • Millimeter Wave Radar

  • Multi-Gig Automotive Ethernet

  • C-V2X

Intelligent Traffic Signal Management

For over 50 years, Sumitomo Electric has been a leading provider of advanced traffic control systems to the Tokyo Metropolitan Police Department's Traffic Control Center, the largest in the world. Our Intelligent Traffic Signal Management system is designed to optimize traffic flow and improve safety by utilizing the extensive knowledge of our experienced engineers in signal timing.

We collaborate with municipal, state, regional, and national agencies to assist them in managing their traffic signal systems and reducing traffic congestion by using high-resolution probe vehicle-based traffic data. By applying our cutting-edge technology and expertise, we strive to create a safer and more efficient transportation system for communities worldwide.

Probe Signal Control

We developed a traffic signal control technology called Probe Signal Control. This technology uses probe-based traffic data, eliminating the need for traffic detectors. It has already been deployed to intersections in Tokyo, Japan, where it has proven to be highly effective in reducing congestion.

Implementing Signal Control API will enable traffic management professionals to monitor and control signalized intersections beyond the limitations of traditional traffic detectors.

Main Features

Area & Intersection Traffic Condition Monitoring
Our technology leverages high-resolution probe vehicle-based traffic data to monitor traffic conditions throughout the target area. It can automatically extract intersections that require signal timing adjustments, making it easy and cost-effective to manage traffic flow. With this technology, there is no need for expensive infrastructure sensors or time-consuming and labor-intensive traffic surveys. The API provides all the information you need to make informed decisions about signal timing adjustments quickly and efficiently.

Signal Parameters Calculation
Automatically creates optimal signal parameters for intersections, including cycle length and split, from high-resolution probe vehicle-based traffic data. By calling the API for real-time traffic data, you can apply an adaptive traffic signal control system that responds to changes in traffic flow as they happen. For average traffic data, the API enables you to design finely-tuned time-of-day signal parameter plans, ensuring that traffic is efficiently managed throughout the day.


We develop innovative and unique technologies that utilize high-resolution probe vehicle-based traffic data to improve traffic signal control. Explore the resources below for further details.

Traffic Signal Control Parameter Calculation Using Probe Data
T Yoshioka, H Sakakibara, R Tenhagen, S Lorkowski & T Oguchi
International Journal of Intelligent Transportation Systems Research 20, 288-298 (2022)

Detection of Congested Intersections Using Car-Probe Data
S Matsumoto, H Sakakibara, Y Nagashima, T Yoshioka & S Nishimura
Sumitomo Electric Technical Review, Number 94 (2022)


We have successfully applied our Probe Signal Control to signal retiming projects, resulting in significant reductions in congestion. For example, we reduced congestion by 17% at the intersection of Kanpachidori Ave. and Hitomi-kaido Ave., and by 21% at the Shinfukuro-Bridge Intersection in Tokyo. These results were reported in the 28th Intelligent Transport Systems World Congress.

Trial Test of Traffic Signal Control Using Probe Information
S Obata, T Seki, T Yoshioka, M Wachi & T Oguchi
28th World Congress on ITS 2022, Los Angeles, 288-298 (2022)

Radar for Detecting Pedestrians

Pedestrian detectors are optimized for roadside modules and were installed on existing poles and arms. They use V2X radio to warn drivers. These detectors have been in use since 2017 in 5 prefectures in Japan.


  • Not affected by changes of weather and day/night
  • Large cover area (40 m x 9 m)
  • High accuracy


  • Transmits 24 GHz radio waves and analyzes reflected waves
  • Distinguished Antenna Design
  • Dedicated algorithm for roadside modules

V2X Solution with Detectors

Driving safety support systems have been operating in Japan since 2015.


Informs signal changes

Supports left turns

Informs if a car is approaching rapidly

Helps prevent blind spot accidents

V2X Solution with Detectors

Newly developed radar detectors for pedestrians and vehicles. Adopting our antenna and logic technologies on our low cost platform. (76 GHz band)


  • Small size and cost effective
  • Optimized coverage area
  • High accuracy
24-GHz band 76-GHz band
Target Pedestrians Vehicles and pedestrians
Resolution 1 m 0.3 m
Antenna Larger Smaller
Status Available (operating in Japan) Under development
Features of radars Not affected by changes of weather and day/night
Features of our product Large coverage area (installed on existing poles and arms) to identify pedestrians and vehicles

Multi-Gig Automotive Ethernet Products with Automotive PHYs

Sumitomo Electric is developing Multi-Gig Ethernet connectivity products with automotive PHYs. This is targeted at In-Vehicle Networks that will enable new levels of autonomous driving.

Cellular Vehicle-to-Everything (C-V2X)

C-V2X is an expected solution for safety and efficiency in road environments by Vehicle-to-Vehicle (V2V), Vehicle-to-Infrastructure (V2I) and Vehicle-to-Pedestrian (V2P) communication. Sumitomo Electric evaluates C-V2X units in our testbed and public roads in Japan.


Frequency 5.8 ~ 5.9 GHz
TX Power 23 dBm
Antenna Diversity (RX)
Power 12 V DC

Engineering sample

Connected Vehicle Experiment

Connected vehicle technology has the potential to significantly prevent or reduce the impact of millions of accidents. Sumitomo Electric has been testing in some scenarios to confirm the advantages of connected vehicles while collaborating with external partners in the real environment.