4 votes

Indiana will test a highway that can charge moving vehicles

4 comments

  1. scroll_lock
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    Comment box Scope: summary, opinion Tone: deeply skeptical Opinion: yes Sarcasm/humor: none An experiment in Indiana, USA to wirelessly charge electric vehicles along a highway while those...
    Comment box
    • Scope: summary, opinion
    • Tone: deeply skeptical
    • Opinion: yes
    • Sarcasm/humor: none

    An experiment in Indiana, USA to wirelessly charge electric vehicles along a highway while those vehicles are in motion.

    Cars and trucks must be equipped with special receivers for the wireless charging to work, meaning current models are incompatible. The coils are installed underground and use magnetic fields to deliver the electricity wirelessly.

    I think this article is funny because the technical solution being described here is essentially an inefficient version of a catenary wire powering an electric train. Unlike a catenary wire, in which the train's pantograph makes contact with the wire aboveground, this experiment tries to wirelessly charge cars from underneath the pavement. It also has a speed limit of 65mph, above which it apparently doesn't work.

    The article does not estimate how much charging could happen while driving a particular unit distance along a highway. My guess is not a whole lot, but I could be wrong.

    Contactless charging is usually relatively inefficient. Copper is expensive. Building/rebuilding long stretches of highways is extremely expensive. Digging up highways to do maintenance on power delivery systems (as opposed to doing work above ground) sounds quite expensive too, not to mention how disruptive that would be to throughput compared to conventional aboveground work. And remember that highways are already inefficient and expensive in their current state. They aren't great ways to move a lot of people quickly or safely (space-inefficient, friction-inefficient, prone to crashes), and they cost more than you think to maintain. Making that whole process even more expensive to operate is probably not workable.

    So this solution is not really a solution, just a way for a state Department of Transportation to waste a lot of money on highways instead of investing in technologies that are more efficient to begin with, like... fully electrified inter-city passenger rail, and even zero-emission freight rail. Or, I don't know, the bare minimum of building more rapid charging stations along interstates, including some such stations for long-haul delivery trucks.

    Indiana could do a lot better. It chooses not to. My recommendation to residents of this state and every other state is to vote for political candidates who support funding for useful transportation projects (especially railroads) and who will subsequently appoint leaders to Departments of Transportation to carry out that mission without pretending it's 1955 where expensive car-centric infrastructure will always the solution to every problem.

    12 votes
  2. [2]
    ackables
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    This sounds like solar roadways all over again. We could just have catenary lines installed for much less cost that would be more efficient at charging a moving vehicle.

    This sounds like solar roadways all over again. We could just have catenary lines installed for much less cost that would be more efficient at charging a moving vehicle.

    7 votes
    1. scroll_lock
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      Comment box Scope: comment reaction, opinion Tone: humorous, then informational/neutral Opinion: yes Sarcasm/humor: sarcastic first sentence, the rest is serious But don't you want to drive on a...
      Comment box
      • Scope: comment reaction, opinion
      • Tone: humorous, then informational/neutral
      • Opinion: yes
      • Sarcasm/humor: sarcastic first sentence, the rest is serious

      But don't you want to drive on a wireless FREAKING roadway?

      For reference, the per-mile cost of installing catenary wires on a train track in the US is about $4.5 million per km (or $7.3 million/mile). That's expensive, but only because it's the US, where we don't know how to build infrastructure (and refuse to learn from other countries). In countries with better construction practices, like France, the cost is more like 1/3 of that. Even less in places like New Zealand.

      The base cost of building a highway in the US is apparently around $19 million/mile ($12 million/km), though I've seen estimates well over double that for the same kind of road. Being extremely generous, the paving of a single lane on a highway is in the millions per mile (a "major [arterial] road" around $1.7 million/mi according to this page; but highways are built to higher standards). That number is an underestimate because it omits the cost to destroy existing pavement to install the wires (with all associated delays), so you can probably double it. Then multiply that by at least 4 for the cost of a small highway. So ~$14 million/mi is, at the bare minimum, double the cost of electrification of a passenger railroad and would likely leave you with a lower theoretical throughput (and definitely a lower maximum speed). The additional copper wiring would skyrocket the cost to greater proportions... it would be at least as expensive as catenary wires ON TOP of the road work. Completely unfeasible.

      My calculations aren't scientific at all, but even if you are pretty lenient, the costs are exorbitant.

      5 votes
  3. json
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    Should make cars be life size scalextric.

    Should make cars be life size scalextric.

    1 vote