Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-15-2010, 06:13 AM   #1 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,541

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,056
Thanked 630 Times in 396 Posts
Traffic sign placement (aiding hypermiling)

You know what I hate?

I hate it when I have a nice good pulse up to the speed limit (or just above), go around a bend in the road, and see a speed limit sign with a lower speed. I go through the bend at 90 km/h and suddenly I have 50-100m to slow down to 50 km/h. WTF, mate? Sure, I can slam on the brakes and slow down, maybe I can even do it in a safe manner, but if I had seen that sign before the bend, not after, then I wouldn't have pulsed from 60 to 90, but instead gently coasted. Umpteen milliliters of fuel gone. Moving that speed limit sign 50m forward wouldn't make anyone late for work, but would help many drivers save fuel.
I've seen "Reduce speed ahead" and "Stop sign ahead" signs in the US, but not all of them were well-placed. Unfortunately, the best I can wish for here is an intermediate speed limit sign slightly earlier, but that hardly ever happens.

So how should traffic signs be placed to aid the hypermiler, maybe even increase safety, while not blocking traffic at the same time? Other than moving speed reductions to more visible places, what about lowering the speed limit on steep hills? In the last week I've seen many places where the speed limit changes from 50 km/h to 70 or 90 at the bottom of a hill, and everyone feels that they are obliged to accelerate uphill, while I'd prefer to keep my speed down until the top of the hill. Similarly, I've seen steep hills with a speed reduction at the crest, as if it couldn't be earlier. In many cases the the climbing speed is lower anyway, because of heavy trucks. A higher speed can be kept if the uphill is right after a downhill, allowing to keep momentum.

Unfortuately, asking whoever is responsible for the road to move the sign only because of potential fuel savings is going to get you laughed at at best.

__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-15-2010, 09:56 AM   #2 (permalink)
EcoModding Apprentice
 
Bicycle Bob's Avatar
 
Join Date: May 2008
Location: N. Saskatchewan, CA
Posts: 1,610

Appliance White - '93 Geo Metro 4-Dr. Auto
Last 3: 42.35 mpg (US)

Stealth RV - '91 Chevy Sprint Base
Thanks: 79
Thanked 354 Times in 248 Posts
Also, let's try to make sure that bicycles have a clear, smooth path when they go downhill if momentum can be preserved for a climb.
  Reply With Quote
Old 05-15-2010, 10:18 AM   #3 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,258

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 284 Times in 197 Posts
Hypermilers are a small fraction of the motoring population. The Department of Transportation should design roads and signage around people who don't even know that driving style affects fuel economy. They should place signs that cause people to DWL whether they know it or not. Speed reductions should coincide with up-grades, rest stops and weigh stations belong at the top of hills, toll booths don't belong at all, etc.

I've occasionally seen the DOT think about the fuel economy impact of their actions, but they're far from consistent. Maybe they need fuel economy activists to make themselves heard? I suppose we could each write a letter to our DOT encouraging DWL-friendly and bicycle-friendly roads and signs.


One unfortunate fact is that villages, where speed limits are slower, tend to sprout up in valleys, where there is water. That's the opposite of what you want for DWL.
  Reply With Quote
Old 05-15-2010, 10:56 AM   #4 (permalink)
Master EcoModder
 
doviatt's Avatar
 
Join Date: Mar 2009
Location: Utah
Posts: 388

Grey Goose (Retired) - '89 Geo Metro LSI 4 door hatch back
Last 3: 57.16 mpg (US)

Tweety - '91 Geo Metro Convertible -2 Door convertible LSI
Team Metro
90 day: 43.97 mpg (US)

Shadow - '02 Honda Shadow VT1100
90 day: 43.46 mpg (US)

Sonic - '07 Honda CBR1000RR
90 day: 42.69 mpg (US)

Filmore - '84 Volkswagen Vanagon
90 day: 20.9 mpg (US)
Thanks: 47
Thanked 44 Times in 31 Posts
Quote:
Originally Posted by Piwoslaw View Post
You know what I hate?

Unfortuately, asking whoever is responsible for the road to move the sign only because of potential fuel savings is going to get you laughed at at best.
So turn the tables and laugh at them first. Take the position of "why were you guys stupid enough to put a speed reduction sign AFTER a curve". Logically that does not make any sense. What makes less sense is an increased limit on a steep uphill?. Also it would be good to find out from the lawmakers in your area why all of the speed changes in the first place. If they have any logic for their reasons at that point they will understand yours.

Around here most roads are at a set limit with temporary, caution or warning limits only (not mandatory or enforced) for curves or dangerous areas. Some times on long stretches there will be a permanent reduction with speed step downs approaching and through a remote town. This is logical because everyone knows why it has changed.
  Reply With Quote
Old 05-15-2010, 11:28 AM   #5 (permalink)
Banned
 
Join Date: Feb 2008
Location: california
Posts: 1,329
Thanks: 24
Thanked 160 Times in 106 Posts
  Reply With Quote
The Following User Says Thank You to tjts1 For This Useful Post:
doviatt (05-15-2010)
Old 05-15-2010, 12:39 PM   #6 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,738

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,572
Thanked 3,508 Times in 2,195 Posts
There is a stretch right out of town where the limit increases from 45 to 55... for, oh, .5 of a mile before you then have to come to a complete stop for a cross road!

So, everybody guns it at that sign, only to come to a stop so shortly after.

I wonder how many gallons of fuel have been wasted at that stretch of road over the years?

I'd like to pull that stupid sign right out so that everybody just continues on at 45 until they have to stop.

Might cost the average driver 2 or 3 seconds over that stretch...
__________________


  Reply With Quote
Old 05-15-2010, 06:55 PM   #7 (permalink)
Master EcoModder
 
Join Date: Jan 2008
Location: Victoria , Australia.
Posts: 499
Thanks: 20
Thanked 46 Times in 33 Posts
Piroslaw,
Sadly poor placement of advisory signs is not limited to any one country and YES we have our share here as well.

One in particular stands out.
A section of 80 km/h roadway which changes to 100 km/h about 300 metres before there is an off ramp leading to a service station / gas station area. The another ramp letting vehicles back on about 500 metres further along.

Ummmm... how about a little common sense here?

Slow the traffic where people are slowing anyway to go into the service are and put the 100 km/h sign another half a kilometer along the road !

Can it really be THAT hard to work out?

Peter.
  Reply With Quote
Old 05-17-2010, 12:50 PM   #8 (permalink)
Master EcoModder
 
wagonman76's Avatar
 
Join Date: Jun 2008
Location: Northwest Lower Michigan
Posts: 1,006

Red Car - '89 Chevrolet Celebrity CL 4 door
Team Chevy
90 day: 36.47 mpg (US)

Winter Wagon - '89 Pontiac 6000 LE Wagon
90 day: 28.26 mpg (US)
Thanks: 8
Thanked 17 Times in 16 Posts
Quote:
Originally Posted by Frank Lee View Post
There is a stretch right out of town where the limit increases from 45 to 55... for, oh, .5 of a mile before you then have to come to a complete stop for a cross road!

So, everybody guns it at that sign, only to come to a stop so shortly after.

I wonder how many gallons of fuel have been wasted at that stretch of road over the years?

I'd like to pull that stupid sign right out so that everybody just continues on at 45 until they have to stop.

Might cost the average driver 2 or 3 seconds over that stretch...
Reminds me of 4 mile road in Traverse City. For whatever reason it's 35 for the longest time when there's really nothing but a handful of houses, then it's 45 for a while, then for the last little bit (probably .5 mile and up a pretty respectable grade too) it's 55 right before the stoplight.

About the "reduced speed ahead" signs (or lack of), it's what they call a speed trap and a revenue generator and if you'll notice there's often a cop sitting just past the line of sight. I was nearly rearended at one going from 55 to 25 around a corner.

I've thought about that too, nearly every town is in a hole by the water and you have to accelerate up and out.

__________________

Winter daily driver, parked most days right now


Summer daily driver
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Idea for government: Traffic Light Timers newtonsfirstlaw General Efficiency Discussion 29 03-10-2012 11:33 AM
BMW advocating for smarter traffic lights abroad and in U.S. MetroMPG General Efficiency Discussion 14 11-13-2009 11:34 PM
Why Hypermiling With A Radar Detector Is Smart Jammer Instrumentation 25 10-07-2009 02:01 AM
My introduction to hypermiling the Smart Ptero Hypermiling / EcoDriver's Ed 12 10-28-2008 07:32 PM
Article: Road traffic up 84% in the U.K. MetroMPG General Efficiency Discussion 20 12-15-2007 02:34 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com