Why Hokkaido's Roads Fall Apart Every Spring

What's going on

Someone driving around Hokkaido noticed the roads seemed rougher than expected — full of bumps, cracks, and potholes — and wondered aloud whether the vast land area just made it impossible to maintain everything properly. The question drew a wave of responses from locals and cold-climate residents ready to explain the real culprit.

The answer is freeze-thaw cycles. Water seeps into tiny cracks in asphalt and concrete, freezes, expands, then thaws — and repeats this all winter long. Each cycle widens the crack a little more, until by spring the road surface is riddled with damage. In Hokkaido and the Tohoku region, this is compounded by de-icing salt that corrodes the concrete, snowplow blades scraping the surface, and studded tire chains grinding it down further. The damage layers up across the whole season.

Come spring, road repair crews fan out to patch what winter left behind. It's become such a reliable seasonal occurrence that locals just call it a spring tradition — until the snow comes back and the whole cycle starts again.

Comments

Does anyone else feel like Hokkaido roads are kind of a mess? Way more bumps and potholes than I expected. Is it just too much land to maintain or what?

ふと気づいたけど北海道の道路って荒れてない？土地が広いから管理できないのかなぁ、凸凹とか陥没多いね

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What do you expect, it’s cold lol

仕方ないじゃん、寒いんだから

People are out here saying Hokkaido roads are unmanaged and all torn up 😭😭

北海道の道路、管理できてなくてボコボコって言われてる😭😭

Hint: snow

ヒント：雪

It’s the snow, that’s why

雪があるからよ

It’s a cold-climate thing. Water expands when it freezes, so any water that gets into cracks in the asphalt keeps freezing and thawing over and over — and it just tears the road apart from the inside out.

これは寒冷地特有の現象なんです。水は氷になると体積が膨張するので、アスファルトの隙間やちょっとした溝に入った水が凍ったり溶けたりを繰り返すと容赦なく道路をボコボコにしてしまうのです。

It’s not just about maintenance — in snowy regions, moisture inside concrete freezes and expands, cracking it; de-icing salt corrodes it; the ground underneath partially sinks and pulls it apart; and tire chains scrape it all up. All of these pile on at once!

補修が行き届いていないというのもあるかもですが、積雪地だとコンクリート中の水分が凍って膨張してひび割れたり、凍結防止剤による塩害によってボロボロになったり、コンクリート下の地面が一部沈下して引っ張られひび割れが起きたり、タイヤチェーンで削られたりして荒れたりします！

They’re called potholes — water seeps in, keeps freezing and thawing, and the pavement just breaks down. A classic cold-climate seasonal staple.

ポットホールと言って染み込んだ水が凍結を繰り返して舗装が痛む寒冷地の風物詩

Here’s a TV news segment from about four years back that covered this. For reference.

4年ほど前のテレビ局の取材動画です。ご参考までに。

Every cold-weather region ends up like this 😮‍💨

寒冷地はどこもこうなる😮‍💨

Snow piling up and then getting plowed — that’s what breaks roads down…

積雪と除雪で劣化するんすよ、道路…

The stretch in front of my house is even worse. Just the fate of cold climates~

うちの前はもっと酷いよ。寒冷地の宿命〜

Ohhh so that’s what it is!! I just figured it was like… normal aging lol

そういうことだったんですね！！老朽化？っておもってました！

More like: aging at an insane rate, yes.

老朽化がものすごいスピードで進む、ですね。

Oh so snow just makes it age way faster!! So I wasn’t totally wrong then lol

あ、雪のせいでスピードが早まるってことになるんですね！！あながち間違いではなかったかな？

Look, if you’ve never lived somewhere with heavy snow it’s understandable — but calling it ‘unmanaged because the land is too big’ is kind of rough ngl. I feel that way too, and I moved here from outside Hokkaido.

雪が少ない地域にお住まいなら想像がつかないのは仕方ないにしても、土地が広いから管理できないのかなとか言われるのは流石に遺憾道外出身で今住んでる身でもそう思ってしまう

Nope. / Standard snowy-country road thing. / Happens everywhere, not just Hokkaido.

否雪国の道あるある北海道に限らん

Same thing happens every spring in Aomori (a prefecture at the northern tip of Japan’s main island, known for some of the heaviest snowfall in the country) too. Some potholes are exactly the width of a bike tire, which is genuinely scary — if you’re cycling around Tohoku (the broader northern region of Honshu, Japan’s main island) in spring, don’t pick up too much speed.

青森も雪が解けると毎年こうなってる。場所によってはちょうど自転車のタイヤがハマるサイズで危ないんで、春の東北でのサイクリングはあんまりスピード出さないほうがいいです

Winter’s just out here breaking everything lol

冬に壊れるからなー

Fate of cold regions. / Repair crews are about to start patching things up all over the place.

寒冷地の宿命これからあちこち修繕の工事が始まります

A Hokkaido spring staple

北海道春の風物詩

So many road construction sites in early spring, every year

春先は工事現場が多いんだよなぁ

Just normal for Hokkaido in early spring

春先の北海道はこれが当たり前

Thought the same thing on a recent trip to Hakodate (a city in southern Hokkaido). Even lowriders get put to the test out here. (試される大地, “The Land of Trials/Challenges,” is Hokkaido’s official tourism tagline; シャコタン/shakotan refers to cars modified to sit very low to the ground — which does not mix well with pothole-ridden roads)

このまえ函館行ったときそれ思ったシャコタンにも試される大地やなって

My take

Even once all that snow finally clears, the roads are still a mess — that's rough in its own way. But apparently crews get everything patched up within roughly a month, which is honestly impressive.

#Surprising #Society

Source & translation note

Comments loosely translated for tone. Reactions collected from Togetter and X threads.

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