Honda R&D Co., Ltd., Taisei Corporation and Taisei Rotec Corporation have verified the effectiveness of a road-embedded system that charges electric vehicles while they drive, in tests on a Taisei test roadway. The companies announced the work on October 5, 2026, and call it a "magnetic coupling wireless power transfer road system." The partners will take part in public-road demonstrations in Japan starting in Japanese fiscal year 2027, which begins April 1, 2027. Honda describes the system as meant for a wide range of vehicles, from passenger EVs to large commercial EVs. It plans to put the technology into practical use first in the logistics and transportation sectors. For large commercial vehicles, the plan is to verify performance at output levels of up to 150 kW. That figure is a verification target, not a result so far, and the system is not in service on any road.
According to Honda's announcement, the ground units and pavement must withstand vehicles of about 20 tons gross vehicle weight. Honda has worked on dynamic wireless power transfer (DWPT) since 2021, and its joint research with the two Taisei companies began in 2025.
How the system is split up
The system has three components, as EV Infrastructure News describes it: a ground DC power supply, a DC distribution-based ground assembly that connects multiple transmitter units embedded in the road, and a receiver installed on the vehicle. Each partner is responsible for a different piece:
- Taisei Corporation: the DC power supply system.
- Honda R&D: the DC distribution-based ground assembly embedded in the road, and the vehicle system with its receiver unit.
- Taisei Rotec: construction methods for building the hardware into road pavement.
The three companies are jointly developing the pavement structures and running durability tests, along with methods for upgrading the roads later. Honda says its unit integrates the inverter and coil into a single DWPT unit for the first time in the world. Its footnote limits the claim to units publicly disclosed as of the end of September 2026, based on Honda's own research. The ground unit is built to be milled into and embedded in existing pavement. In the announcement, Honda says the design gives the system "excellent ease of installation in road pavement."
Where testing happens, and in what order
The program moves from closed test roads to an operating expressway.
| Site | Type | Status |
|---|---|---|
| T-FIELD/SATTE (Taisei Group, Satte) | Existing test roadway | Experiments and validation tests conducted |
| T-FIELD/TAMRA (Taisei Group, Tamura) | New test roadway | Construction planned to start in late 2026 |
| Tateyama Expressway, Chiba | Public road (NEXCO East's Tateyama Project) | Demonstrations from Japanese FY2027 (April 1, 2027 onward) |
The public-road work is part of the "Tateyama Project," run by East Nippon Expressway Company Limited (NEXCO East), which operates the expressway. The three companies will take part in it. From October 20, 2026, that start date is 163 days away.
What the trials are meant to prove
Honda lists several areas the next phase will test:
- Durability. At T-FIELD/TAMRA, the partners plan a long-term loading test with actual vehicles, equivalent to 1 million wheel loads at 49 kN per wheel.
- Power transfer performance. Engineers will check how well the system delivers energy to a moving vehicle, including at output levels of up to 150 kW for large commercial vehicles.
- Electromagnetic field (EMF) leakage. The partners will evaluate measures that limit stray magnetic fields.
- Ground unit safety. The embedded units will be evaluated alongside power transfer performance.
- High-speed reliability. They will test whether power transfer holds up for vehicles traveling at high speeds.
CleanTechnica reports that the collaboration has reached the validation testing stage. It says the first focus is trucks and other large commercial vehicles, with in-ground hardware designed for heavy loads. Honda sees logistics and transportation as the sectors with the highest expected returns. The outlet adds that wireless-equipped passenger EVs are not expected at Honda dealers any time soon.
Where this fits
Honda's program joins earlier in-road charging demonstrations. CleanTechnica lists projects in Germany and Sweden, on the Pennsylvania Turnpike, and in Detroit and Indiana. It also cites Florida's planned SR 516, a new 125-mile highway linking Lake and Orange counties that is planned to include about four miles of in-road wireless charging. The Japanese trials add a heavy-vehicle durability test and an expressway demonstration run with the road's operator.
What It Means for Drivers
No vehicle can charge on this system today. The hardware is in place only on Taisei test roadways in Japan. Charging requires Honda's vehicle-mounted receiver, so only vehicles fitted for the system will be able to use it. Honda's long-term aim covers passenger EVs as well as large commercial vehicles, but practical use is planned first in logistics and transportation. Truck operators are the first group this is meant to serve.
The next public milestone is the start of demonstrations on the Tateyama Expressway in Chiba from April 2027. Results from that work and from the T-FIELD/TAMRA durability and EMF tests will show whether in-motion charging can deliver the planned power at expressway speeds on a working road.
