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consumer451
Largest wildlife overpass in North America reduced wildlife collision by 91% reddit.com

JKCalhoun8 hours ago

I've seen it and a few others on recent road trips.

Additionally, Colorado (and other states) are putting these "animal escape ramps" along the sides of highways.

From what I can gather, a fence runs along the freeway on both sides—presumably to keep the wildlife out. But, I suppose in case an animal makes it into the danger zone, every mile or so there are dirt berms built against the fence that provide a way up and over the fence. Presumably they drop off on the other side so an animal is not as likely to use these in reverse: to get into the danger zone.

Additionally, there are often small partitions at each berm, jutting out from the fence. I imagine an animal following along the fence—when they arrive at the partition, they either go around it and continue, or do the right thing: climb the berm to get to the other side of the fence.

(Apparently called "Jump Outs": https://www.dot.state.wy.us/home/news_info/district_news_inf...)

tobias20146 hours ago

Practical Engineering has a good video about wildlife crossings (2024): https://www.youtube.com/watch?v=5mYpQWPtfpo

ChrisArchitect9 hours ago

morninglight6 hours ago

We need more of these - for pedestrians!

ChrisArchitect9 hours ago

As expected from the press release at open about 9 months ago. (they estimated 90% reduction https://news.ycombinator.com/item?id=46321557)

The $15M price tag still seems like a lot. Happy for the critters and motorists tho

consumer451op8 hours ago

The ROI is beyond solid. It's actually insane this wasn't done sooner at this location. The normal ROI for a wildlife crossing is 15 years. Here, it's two to three years.

> Cost savings: Each prevented wildlife–vehicle collision can save thousands of dollars—more than $19,000 per deer crash, $73,000 per elk, and $110,000 per moose—in vehicle, injury, and wildlife costs, making well-placed crossings a strong investment [0]

This section of highway had one deer-vehicle collision per day.

365 * $19,000 = $6,935,000 per year.

[0] https://www.pew.org/en/research-and-analysis/fact-sheets/202...

___

edit: this post and resulting thread made me realize that "wildlife crossing" sounds far too tree-hugger for our society. They need to rebrand to "obvious money-saving infrastructure," or better.

lennartb7 minutes ago

I know cost-effectivness is often the deciding factor, but that's kinda sad, so: One deer hit a day, down 91% means ~330 deers saved per year. $15m spread over the working population (160m) of the US is less than $0.10 per person. So you're spending $0.10 to save 330 deer, which is a trade I would make.

userbinator6 hours ago

This section of highway had one deer-vehicle collision per day.

That sounds like an extreme outlier.

[deleted]6 hours agocollapsed

tenuousemphasis6 hours ago

Yes, they place these at places where they're needed, the outliers.

cameldrv6 hours ago

Something like this only costs $15m because the incentives are crap. You know it if you've driven past any road construction project. 90% of the people at any given time are standing around. You have to pay just as much for a person to stand around as you do for them to be doing useful work.

Fixing the incentives is not easy at all. There are a lot of "good reasons" why this happens. Many of them are failures down the line, but no one at the contractor level pays the price for not mitigating them, so they don't. If a truck doesn't arrive on time, you could find something else useful to do, or you could just stand around waiting. If you/your company is paid by the hour, it's more profitable to stand there.

Your company could also charge the trucking company for arriving late, or the concrete plant for making them wait. This is not customary in the industry though.

Suppose you fixed all of this though. For a given number of construction projects, you'd need way less labor. If profits are a percentage of costs, less labor means less profit. Making things more efficient means the construction company has to lay a bunch of people off and make less profit, so their incentive is to convince the government that inflated costs are reasonable.

I'm not sure what the solution is. Laying people off is painful. However, one thing you might do would be to do more work for the same money, or higher quality work for the same money.

onlypassingthru7 hours ago

$15M is less than 4 Patriot PAC-3 MSEs. Which do you prefer your taxes to be spent on?

ornornor4 hours ago

It’s not “burn 15M on missiles or spend it inefficiently on infra buildout”. It could also be “spend half as much on efficient infra buildout”

kazinator8 hours ago

$15M is dirt cheap for the USA. That buys you like 100 yards of urban light rail or something. :)

coryrc8 hours ago

If I did the math right, Seattle-area Federal Way Link Extension costs $185k per yard, getting 81 yards for $15M.

God we're terrible at building things.

shawn_w3 hours ago

Don't forget the decades of time it takes to build the tracks.

kQq9oHeAz6wLLS7 hours ago

Is that the California high speed rail I see trying to hide in the back?

sharts7 hours ago

That’s like one decently sized house with a yard and garage in a good neighborhood in the bay area

mrDmrTmrJ8 hours ago

Cool - want to suggest changes to the legal code to lower the cost?

tenuousemphasis6 hours ago

No more cost plus contracts.

sophacles8 hours ago

Instead of doing that boring thing the unthinking do - I challenge you to ask why 15M seems like a lot.

Is it a lot in comparrison to the costs to the taxpayers for all the emergency crews responding to animal caused accidents over the lifetime of the crossing, not to mention dealing with carcasses of animals, etc?

How much of any single person's tax money went into it? How long until those few cents get paid off in terms of saved time and gas by not dealing with the traffic backup from those accidents? How much do those few cents amortize to your savings in reduced insurance since thats less potential accident you have to bet against... how much savings does that reduction confer on your expected direct costs in cas you had been in a the accident?

Does 15M still seem like a lot?

Maybe you think it could be built cheaper - how? Show your work.

All these things sure are an interesting conversation to have. Much more interesting than "hur dur, 15M is a big number" anyway.

Terr_8 hours ago

Just trying some napkin math...

Some very surface-level searching shows someone claiming a total societal cost of ~$7k per deer collision.

Supposing it's a $15m construction and could last 30 years without major maintenance, then it needs to stop ~71 events per year to "pay for itself".

To be fair, that is the cost of collisions rather than any near-misses and traffic problems, or the less-quantified ecological cost.

jdyer95 hours ago

That seems well within reason, an article said about 1 deer collision prevented per day in the spring and fall high season. Having driven through the area and seen dashcam footage of collisions and near collisions, that $7k makes sense to me. I've known several people that have hit deer on the highways here, and I'm actually surprised if anything that the number is that low.

So my gut feeling is that it actually has slightly better returns than expected from those numbers.

distances3 hours ago

The article linked by JKCalhoun lists

  Deer  $6,617
  Elk   $17,483
  Moose $30,760

AmazingEveryDay10 hours ago

[flagged]

whatisthiseven9 hours ago

This is peak bean soup theory on HN.

Always has to be at least one commenter, "but what about my highly specific scenario? All the other people benefiting are an aberration to my specific need or wild singular example"

Fund SNAP, not discount game meat through the deaths of others.

probablyStimmed9 hours ago

Nailed it. Adding the fact that the majority of HN comments are negative or at least at odds with the post, HN is a bean soup fallacy/theory/dilemma generation system.

consumer451op9 hours ago

Agree 100%. Also, hitting a deer at highway speeds can lead to the death of the occupants of the vehicle.

This is not some country road!

This is an actual win-win scenario, for humans and wildlife.

ducktoysleftout9 hours ago

SNAP is funded. Food pantries are abundant. Nobody is eating roadkill to survive as a matter of necessity. If you’re eating carrion that’s probably a lifestyle choice and indicative of some mental illness.

A wildlife overpass is certainly not going to be cheap, but I could see the road user safety benefit penciling out over the life of the asset. I wonder why you would send the animals over (and span the whole roadway) rather than under (cut and cover a box culvert). Either way, it would be nice to see this better funded for rural America.

gausswho8 hours ago

The CBS article (https://www.cbsnews.com/colorado/news/largest-wildlife-overp...) mentions there's one large overpass which gets all the attention, but also there's five underpasses. There's a photo of some deer using one towards the bottom.

ghostsigns8 hours ago

The lives of the animals also matter.

On a related note, they don’t send them under because most wild animals do not like enclosed tunnels and would not use them.

[deleted]8 hours agocollapsed

Terr_8 hours ago

> SNAP is funded.

Disregarding the weird roadkill thing: "Funded" isn't necessarily a meaningful determination, since Congress providing 100% funding for $5 that zero people are eligible to receive would also be "fully funded."

In 2025 Republicans slashed its budget by the biggest cut in history, and today participation is the lowest in 17 years.

I doubt any of us honestly believe the drop is because everybody's financial situation has gotten way better right now, or because groceries got cheaper.

https://www.cbpp.org/research/food-assistance/snap-tracker-p...

DANmode8 hours ago

> Nobody is eating roadkill to survive as a matter of necessity

Wrong.

Especially in places that culturally frown upon wasted food / meat.

gucci-on-fleek10 hours ago

> there are many people that have a significant reliance on roadkill to fulfill their dietary needs.

I doubt that many people are collecting roadkill on a 75mph 6-lane divided freeway though, since I can't really think of any safe way to collect it.

But even if you could collect it, hitting anything small at that speed will completely pulverize it, and hitting anything larger will seriously hurt the vehicle's occupants, so it's probably best to stick to smaller roads.

dendrite99 hours ago

Last thought before the deer goes through my windshield and kills me is: "At least someone can eat this roadkill."

Reducing car/animal collisions is a good thing for cars(drivers) and animals.

[deleted]9 hours agocollapsed

malfist9 hours ago

My brother almost died in a car wreck with a deer.

probablyStimmed9 hours ago

Ignoring my incredulity at this response, the risk to the lives of the drivers seems to me to be of greater importance than the potential that some people might benefit from the carcasses lying on the side of road.

anonymars8 hours ago

I have to admit, my life would be a little more boring without some of the hot takes I find here sometimes

Like, maybe I can just buy you a cheeseburger instead of totalling my car

pvaldes10 hours ago

> going to bed with a deep hunger in the pit of one's stomach.

I'm fine with that, as their dinner shouldn't depend on me suffering an horrible car crash and being hurt or killed.

The people will save a lot of money if they don't need to replace 500 cars each year, therefore more money to feed themselves. They will not be forced to eat dog corpses.

maartenscholl7 hours ago

Surprised it took so long for a car-centric country to get on board with these

PeterHolzwarth8 hours ago

"This area was getting about one deer hit a day"

Relative to how many didn't get hit, what's the percentage there?

majormajor8 hours ago

I'm curious about the POV you're coming from. I don't think the number of deer who don't get hit is relevant to the math on injury prevention, traffic prevention, and ongoing operational and property damage costs.

kazinator8 hours ago

Well, yes; for that you need the number of cars that that don't hit a deer. :)

xboxnolifes4 hours ago

No you don't. You only need total costs of accidents before and after this crossing.

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