Wireless charging lane for bus and shuttle routes

Speculative concept
AI illustration · Illustrative scene, not a photograph of the specific device or experiment.

This is an idea, not a product. Nothing here has been built or tested unless a linked technology profile says so.

The problem

Operators of fixed-route electric buses and shuttles may need to recharge during service without long plug-in stops at a depot or terminal. A road-based charging section may help where the same vehicles repeat the same short route every day.

The idea

A first version would electrify one short, dedicated section of a fixed bus or shuttle loop with inductive coils in the road surface, and fit a receiver to one or two test vehicles. The section would meter grid input and the energy received by the vehicle, so the team can measure end-to-end efficiency before any wider work. It would start on a closed or dedicated test loop, not open traffic, and would not claim reliability across a whole network.

Enabling technology

  • Wireless charging roads: Dynamic wireless charging uses coils built into a road to send electricity by magnetic induction to a compatible vehicle while it moves. Short public and test-track pilots report that the energy transfer can work, but efficiency, cost and durability over years have not been shown independently.

What stands in the way

  • Efficiency is not yet shown end to end. Energy delivered to a vehicle does not give the grid-to-battery figure, and the sources reviewed do not report that figure.
  • Standards do not yet fully cover dynamic road charging. SAE J2954 leaves dynamic applications to a later part, and IEC PAS 61980-5 is a specification, not proof of certification or interoperability between suppliers.
  • Cost is uncertain. Sweden's planned permanent electric road was cancelled on cost grounds, but the sources do not state which electric road technology it used, so it is not direct evidence for inductive lanes. A lane would need its own cost case that includes road works and the grid connection.
  • Durability is unproven. The sources reviewed do not report performance over years under weather, heavy traffic, road repair or buried coil failure.
  • Each vehicle needs a receiver fitted underneath, and a shared standard across vehicle and road suppliers is not yet shown, so a lane would initially serve only a chosen fleet.

A cheap way to test it

Build a bench rig with a road-side coil driven by an isolated power supply and inverter, and a receiver coil on a fixed sliding mount feeding a resistive load. Run the rig under the lab's electrical safety rules, with trained staff only. Set the air gap and lateral offset at a few fixed positions. At each position, record grid input power and receiver output power, and calculate efficiency as receiver output divided by grid input. Repeat each run at least three times. Write the efficiency target, the repeat-run spread and a temperature limit for the coils down before the first run. Pass if efficiency at each position meets the written target, repeat runs agree within the written spread, and the coils stay under the temperature limit. Measure the magnetic field at the bench edge with a field meter and keep it within the exposure limit set by the lab's safety officer. The result covers bench efficiency only, not road-side performance. No human or vehicle trial is included.