id: 06560926
dt: j
an: 2016c.00706
au: Pollak, Henry
ti: Why does a truck so often get stuck in our underpass?
so: Consortium 109, 39-40 (2015).
py: 2015
pu: COMAP (Consortium for Mathematics and Its Applications), Bedford, MA
la: EN
cc: G40 G60 M90
ut: mathematical model building; mathematical applications; real-life
mathematics; traffic; road; truck; bridge; clearance; height; length;
plane geometry; triangles; angles; trigonometry
ci:
li:
ab: From the text: It just doesn’t seem reasonable that trucks should have as
much trouble as they do. After all, in every case I know, the road
leading to the underpass has a sign indicating the clearance.
Furthermore, it is natural to assume that the driver knows the height
of the truck and is capable of comparing the two numbers and making an
appropriate decision. And yet, the problem kept happening. I haven’t
kept any records, but I think they have decreased the clearance
indicated on the sign at least twice in recent years. What’s the
matter, does the railroad bridge over the highway settle a little more
every few years, or is the highway department just unable to hire
anyone who can measure the distance between the pavement and the bottom
of the bridge? Surprisingly, I think it’s neither of these: I think
the trouble is that trucks have gotten longer!
rv: