AARoads Forum

Please login or register.

Login with username, password and session length

Author Topic: Road Sign Math  (Read 23417 times)

hbelkins

  • *
  • *
  • Offline Offline

  • Posts: 13773
  • It is well, it is well, with my soul.

  • Age: 58
  • Location: Kentucky
  • Last Login: Today at 03:41:10 PM
    • Millennium Highway
Road Sign Math
« on: December 21, 2009, 09:26:08 PM »

Anyone remember the Road Sign math site at http://www.roadsignmath.com? It's been dormant for quite awhile.

Maybe we should resurrect the topic here.
Logged

agentsteel53

  • invisible hand
  • *
  • *
  • Offline Offline

  • Posts: 15374
  • long live button copy!

  • Age: 38
  • Location: San Diego, CA
  • Last Login: November 21, 2016, 09:58:39 AM
    • AARoads Shield Gallery
Re: Road Sign Math
« Reply #1 on: December 22, 2009, 12:14:45 AM »

sure; this is a good way of bringing in other sign photographs that are not shield related.

here is a rule for continuity ... all posted photos must obey the math rule, as seen on that website, and furthermore one number from the previous photo must appear in the next one.

the math rule, in short, is you have to take a single sign (in our case, let's extend it to a single gantry if you want, as long as all the signs are facing one direction) and using all the numbers exactly once, write an equation that is correct.

I'll start off with something simple.



9 x 2 = 8 + 10

next poster has to come up with another photo that has at least one 2, 8, 9, or 10, and of course a correct equation.  Good good?  yes yes.  
Logged
live from sunny San Diego.

http://shields.aaroads.com

jake@aaroads.com

Scott5114

  • *
  • *
  • Offline Offline

  • Posts: 8313
  • Age: 29
  • Location: Norman, OK
  • Last Login: Today at 02:35:53 PM
    • Denexa 100% Plastic Playing Cards
Re: Road Sign Math
« Reply #2 on: December 22, 2009, 12:31:57 AM »

Where is Carol Vorderman when you need her?
Logged

WNYroadgeek

  • *
  • Offline Offline

  • Posts: 384
  • Age: 29
  • Last Login: Today at 12:16:44 AM
Re: Road Sign Math
« Reply #3 on: December 22, 2009, 01:30:31 AM »



1+1+7=9
Logged

xonhulu

  • *
  • Offline Offline

  • Posts: 1326
  • Location: Salem, OR
  • Last Login: September 25, 2017, 09:45:41 PM
Re: Road Sign Math
« Reply #4 on: December 22, 2009, 01:40:47 AM »

So can we break up numbers into their component digits?  I got the impression the Road Sign Math site didn't do that.
Logged

xonhulu

  • *
  • Offline Offline

  • Posts: 1326
  • Location: Salem, OR
  • Last Login: September 25, 2017, 09:45:41 PM
Re: Road Sign Math
« Reply #5 on: December 22, 2009, 02:26:29 AM »



O.k., this took some figuring but I finally figured it out:

sqrt((sqrt(82-101/101))!/(sqrt(59+5))!)=21/sqrt(47+2)

« Last Edit: March 21, 2012, 10:56:32 PM by xonhulu »
Logged

agentsteel53

  • invisible hand
  • *
  • *
  • Offline Offline

  • Posts: 15374
  • long live button copy!

  • Age: 38
  • Location: San Diego, CA
  • Last Login: November 21, 2016, 09:58:39 AM
    • AARoads Shield Gallery
Re: Road Sign Math
« Reply #6 on: December 22, 2009, 03:30:25 AM »

So can we break up numbers into their component digits?  I got the impression the Road Sign Math site didn't do that.

for now, let's go with all numbers to be treated as they are, but if we have trouble coming up with examples (the Road Sign Math site hasn't been able to find one in two years :-D) then we can relax the rules.
Logged
live from sunny San Diego.

http://shields.aaroads.com

jake@aaroads.com

hbelkins

  • *
  • *
  • Offline Offline

  • Posts: 13773
  • It is well, it is well, with my soul.

  • Age: 58
  • Location: Kentucky
  • Last Login: Today at 03:41:10 PM
    • Millennium Highway
Re: Road Sign Math
« Reply #7 on: December 22, 2009, 09:08:44 AM »

Road Sign Math didn't require the "use a number in the previous example" bit, but I understand this site is a bit different. RSM used to be on some different format but changed to the blog-style format (I think they use WordPress) shortly before going dormant. And I had a bunch of examples to send to them before they assumed room temperature.
Logged

74/171FAN

  • *
  • *
  • Offline Offline

  • Posts: 1628
  • Age: 27
  • Location: Harrisburg, PA
  • Last Login: Today at 03:19:59 PM
Re: Road Sign Math
« Reply #8 on: December 22, 2009, 10:43:41 AM »


5-5=31(199-199)
Logged
I am now a PennDOT employee.  My opinions/views do not necessarily reflect the opinions/views of PennDOT.

hbelkins

  • *
  • *
  • Offline Offline

  • Posts: 13773
  • It is well, it is well, with my soul.

  • Age: 58
  • Location: Kentucky
  • Last Login: Today at 03:41:10 PM
    • Millennium Highway
Re: Road Sign Math
« Reply #9 on: December 22, 2009, 11:28:57 AM »

The above would not work according to http://www.roadsignmath.com/rules/
Logged

xonhulu

  • *
  • Offline Offline

  • Posts: 1326
  • Location: Salem, OR
  • Last Login: September 25, 2017, 09:45:41 PM
Re: Road Sign Math
« Reply #10 on: December 22, 2009, 12:39:07 PM »

Thanks for that reference, HB.  I see now that my earlier work violated the rules since 101 occurred twice and I used it twice.
Logged

Riverside Frwy

  • *
  • Offline Offline

  • Posts: 223
  • California State Route 91 - The Riverside Freeway

  • Location: Corona, CA
  • Last Login: June 15, 2013, 02:47:02 AM
Re: Road Sign Math
« Reply #11 on: December 22, 2009, 07:22:30 PM »

Thanks for that reference, HB.  I see now that my earlier work violated the rules since 101 occurred twice and I used it twice.

I JUST noticed that 199 the left side of the photo.
Logged

74/171FAN

  • *
  • *
  • Offline Offline

  • Posts: 1628
  • Age: 27
  • Location: Harrisburg, PA
  • Last Login: Today at 03:19:59 PM
Re: Road Sign Math
« Reply #12 on: December 22, 2009, 07:32:06 PM »

Thanks for that reference, HB.  I see now that my earlier work violated the rules since 101 occurred twice and I used it twice.

I JUST noticed that 199 the left side of the photo.
  I just realized I did an epic fail too
Logged
I am now a PennDOT employee.  My opinions/views do not necessarily reflect the opinions/views of PennDOT.

WNYroadgeek

  • *
  • Offline Offline

  • Posts: 384
  • Age: 29
  • Last Login: Today at 12:16:44 AM
Re: Road Sign Math
« Reply #13 on: December 22, 2009, 09:23:59 PM »



78-78=16*(20-20)
Logged

xonhulu

  • *
  • Offline Offline

  • Posts: 1326
  • Location: Salem, OR
  • Last Login: September 25, 2017, 09:45:41 PM
Re: Road Sign Math
« Reply #14 on: December 22, 2009, 11:21:07 PM »

Thanks for that reference, HB.  I see now that my earlier work violated the rules since 101 occurred twice and I used it twice.

O.k. I just re-read the rules and saw that I actually should have used 101 twice since it appeared twice in the photo, so my math did follow the rules.

No put-down to WNYroadgeek and 74/171FAN, but you both used basically the same formula ( a-a = c(b-b) )  and this will always work on any assembly or sign where two routes are repeated  (you can always get 0=0).  The same is true in this photo:



Now, I could go the 15 - 15 = 29(211 - 211) route, but it takes more to see this one: 15 + 15 - (211/211) = 29

We should try to be creative and have fun with this game.  In fact, this game might be a little more fun if one person posts a sign and have others try to find a math equation for it (the poster should already know one exists).  Any thoughts?
« Last Edit: March 21, 2012, 11:04:21 PM by xonhulu »
Logged

hbelkins

  • *
  • *
  • Offline Offline

  • Posts: 13773
  • It is well, it is well, with my soul.

  • Age: 58
  • Location: Kentucky
  • Last Login: Today at 03:41:10 PM
    • Millennium Highway
Re: Road Sign Math
« Reply #15 on: December 23, 2009, 12:57:49 AM »

OK, here's an easy one for you.

Logged

xonhulu

  • *
  • Offline Offline

  • Posts: 1326
  • Location: Salem, OR
  • Last Login: September 25, 2017, 09:45:41 PM
Re: Road Sign Math
« Reply #16 on: December 23, 2009, 01:14:58 AM »

1*2^3 + 6 = 14

Logged

agentsteel53

  • invisible hand
  • *
  • *
  • Offline Offline

  • Posts: 15374
  • long live button copy!

  • Age: 38
  • Location: San Diego, CA
  • Last Login: November 21, 2016, 09:58:39 AM
    • AARoads Shield Gallery
Re: Road Sign Math
« Reply #17 on: December 23, 2009, 01:19:22 AM »

1*2^3 + 6 = 14



you forgot to solve for N ;)
Logged
live from sunny San Diego.

http://shields.aaroads.com

jake@aaroads.com

agentsteel53

  • invisible hand
  • *
  • *
  • Offline Offline

  • Posts: 15374
  • long live button copy!

  • Age: 38
  • Location: San Diego, CA
  • Last Login: November 21, 2016, 09:58:39 AM
    • AARoads Shield Gallery
Re: Road Sign Math
« Reply #18 on: December 23, 2009, 01:39:06 AM »

also, your turn to post a photo.  I think this is a good way to ensure continuity...
Logged
live from sunny San Diego.

http://shields.aaroads.com

jake@aaroads.com

hbelkins

  • *
  • *
  • Offline Offline

  • Posts: 13773
  • It is well, it is well, with my soul.

  • Age: 58
  • Location: Kentucky
  • Last Login: Today at 03:41:10 PM
    • Millennium Highway
Re: Road Sign Math
« Reply #19 on: December 23, 2009, 10:28:12 AM »

1*2^3 + 6 = 14



Actually, all numbers used (including the sum) must be included on the sign and all signs must be on the same assembly. That's why, in the RSM game, two or more signs on independent posts wouldn't count unless there was a stabilizing bar installed. I remember submitting a sign to RSM and it being rejected because of this. Then during a sign replacement project, a connecting bar was added and the sign assembly became eligible. There was no 1 or 14 on the sign; I know you got them from the bridge height warning sign in the background but the only eligible numbers were on the BGS. 2 x 3 = 6.

There's another candidate just a few miles up the road from that sign on I-90 in Pennsylvania.
Logged

Truvelo

  • *
  • Online Online

  • Posts: 1748
  • Speed limits limit life

  • Age: 42
  • Location: United Kingdom
  • Last Login: Today at 03:54:43 PM
Re: Road Sign Math
« Reply #20 on: December 23, 2009, 10:41:44 AM »

Here's another no-brainer :colorful:

Logged
Speed limits limit life

hbelkins

  • *
  • *
  • Offline Offline

  • Posts: 13773
  • It is well, it is well, with my soul.

  • Age: 58
  • Location: Kentucky
  • Last Login: Today at 03:41:10 PM
    • Millennium Highway
Re: Road Sign Math
« Reply #21 on: December 23, 2009, 11:01:25 AM »

You're probably going for 1 + 1 + 2 = 4, but you can't split numbers up in a sign, according to the original RSM rules. "12" is "12," not "1" and "2."
Logged

Truvelo

  • *
  • Online Online

  • Posts: 1748
  • Speed limits limit life

  • Age: 42
  • Location: United Kingdom
  • Last Login: Today at 03:54:43 PM
Re: Road Sign Math
« Reply #22 on: December 23, 2009, 11:08:27 AM »

Ok, but this one works. 39+51=90

Logged
Speed limits limit life

xonhulu

  • *
  • Offline Offline

  • Posts: 1326
  • Location: Salem, OR
  • Last Login: September 25, 2017, 09:45:41 PM
Re: Road Sign Math
« Reply #23 on: December 23, 2009, 03:14:16 PM »

you forgot to solve for N ;)

Cool, because a variable would make all the problems really easy. :nod:

Anyway, you're right, I should post a follow-up photo.  This one has at least one solution, not using 0 = 0:

« Last Edit: March 21, 2012, 11:06:12 PM by xonhulu »
Logged

agentsteel53

  • invisible hand
  • *
  • *
  • Offline Offline

  • Posts: 15374
  • long live button copy!

  • Age: 38
  • Location: San Diego, CA
  • Last Login: November 21, 2016, 09:58:39 AM
    • AARoads Shield Gallery
Re: Road Sign Math
« Reply #24 on: December 23, 2009, 06:53:36 PM »

211 + (13/13) + (99/99) - 2 + 11 - 8 = 214

not quite 0 = 0 but still a kinda trivial solution involving the 13/13 and 99/99.  nowhere near as impressive as that WW2 era OR-2/US-101 photo!
Logged
live from sunny San Diego.

http://shields.aaroads.com

jake@aaroads.com

 


Opinions expressed here on belong solely to the poster and do not represent or reflect the opinions or beliefs of AARoads, its creators and/or associates.