h a l f b a k e r y
Naturally, seismology provides the answer.
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Bike paths, here in the USA, when they exist at all, tend to exist along only one side of the road. So, sometimes a cyclist will be traveling with the automobile traffic, and sometimes against that traffic.
Now consider a cyclist going against traffic, and reaching an ordinary intersection/road-crossing.
Two branches of the intersection are of course part of the road that the cyclist has been riding near; one branch of the intersection is on the other side of that road, from the cyclist, and the fourth branch is, in this example, what the cyclist needs to cross.
Now consider a vehicle waiting in that fourth branch of the intersection, preparing to make a turn toward the cyclist. Carefully note that the car won't have to cross any traffic to make the turn, if simply getting into the nearest lane; it just has to join the traffic flow in that lane.
So the driver will be waiting for an opening, and will be observing the traffic that is moving toward both the car and the cyclist, as the cyclist approaches the intersection.
Depending on habit, with respect to making this kind of turn at an intersection, the driver may fail to look both ways, and thus would fail to see the oncoming cyclist. I personally have had to jump off my bike a couple of times to avoid getting run over by cars turning at intersections, as described above.
So, here is where the Truck Horn for Bicycles comes into the picture. Mounted for convenient activation, it includes a very small wheel-mounted generator that (A) trickle-charges a capacitor bank, and (B) extracts so little power from the cycling effort that the cyclist barely notices.
However, when the horn button is pressed, the capacitor bank is disharged through it, and the driver of the automobile, waiting to turn at the intersection, will thus be loudly informed of a need to look both ways, before turning.
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||saw one of those stupid buggers come || close to getting creamed the other day: I almost would've applauded if he had: at a red light he came barrelling up between two full lanes and right into the intersection where an opposing direction vehicle was turning left with an advanced green.
||Used to be bicyclists who weren't part of vehicular traffic (ie: kids using the sidewalk) had to dismount and walk across intersections.
||There was a guy at the University I dropped out of twice
who built 'art bikes'. One he rode frequently had a 10-
gallon pressure tank and a lobsterboat horn mounted across
the handlebars. It was hilariously deafening.
||I could imagine a thin aluminum ramp, mounted parallel with the bike above the ride and extending in fromt of the bike a good distance. On approaching a car the ramp swings down. The front goes under the wheel of the bike while the back flops on the obstacle, thus creating a ramp the rider can use to jump over the obstacle.
||Now THERE'S an idea. Go post it and we will refine it.
||I have had some serious Cadillac horns on my motorcycles (+).
||You're gonna love my Cat Riding a Horse-Shaped
Bicycle idea, [8th].
||Sacre bleu! Le entrée est un automaton! Mon dieu, she has
bitten le saucier!
||Perhaps if you built a giant wooden badger
||A train horn would be even better.
||I used to live in Atlit not far from the railway.
||One night we heard the train horn, a deep: Boooop,
Booooop, BoooBooBoooop. Then a roar that sounded
like thousands of people yelling hooray.
||It repeated itself twice. I ran out of the house and
saw the train painted in green with green flags and
people leaning out the windows and open doors,
while the train slowly proceeded towards Haifa.
||It turns out the town's soccer team fans "bought the
train" and where on a triumphant ride home.
||Seriously... get a vuvuzla or however its spelt.
||A guy came to buy a house in Atlit. There's a
beautiful view on one side to the sea and crusader
castle, on the other to the Carmel mountains, and
from the porch you can see the blowhole. The palm
trees from the famous Aronson plantation sway in the
wind seen from the bedroom. Its perfect. Just when
he decides to buy the house there's a terrible
crashing noise sustained for 3 minutes then a loud
horn, while the windows tremble. What was that?! he
askes. Oh, only the train. But after two weeks you
get used to it. OK, the guy says, I'll come back in two
||Ahmad was riding the Emeq train from Cairo to
Damascus under the Turks before WWI. Suddenly,
about half an hour before Afulla station, Abdullah his cousin rides up adjacent to the train with his donkey.
How's Fatima and how are the kids? Hamdullah they're
all ok. How are you doing? Fine. Listen I'm in a hurry.
I have a meeting in 5 minutes in Afula, So I gotta
run. He hits the donkey which quickly walks ahead of
the train and they are soon lost in the horizon.
||During WWI the chief Turkish train engineer, Jewish
Dr. Meir Gurevich, attached a German war plane
motor to a railcar, and they sped faster than any
train had gone before. I don't think they had a horn.
||Pretty similar but for motorbikes. [link]