Skip to comments.Texas (80mph!), Iowa (70), Indiana(70) Raise Maximum Speed Limit
Posted on 06/27/2005 8:37:42 PM PDT by Diddle E. Squat
Drivers in Texas, Iowa, and Indiana will enjoy higher speed limits next month as legislation raising the top speeds on rural roads takes effect.
On Friday, Texas Governor Rick Perry (R) signed HB 2257 into law making 80 MPH the maximum allowable speed in the state. Rural portions of I-10 and I-20 will enjoy the new top speed, while other rural roads could see the limit rise to 75 MPH. Both the state House and Senate adopted the legislation without opposition last month.
On July 1, a law signed by Iowa Governor Tom Vilsack (D) creating a 70 MPH speed limit goes into effect. This new limit better reflects the actual speed of cars on rural highways which averages 69.8 MPH according to sensors embedded into the pavement.
In May, Indiana Governor Mitch Daniels (R) signed SB 217 into law raising the maximum limit from 65 MPH to 70 MPH in areas with less than 50,000 population. The law also raises the limit for trucks from 60 to 65 MPH, and gives a 10 MPH boost to several roads currently posted at 55 MPH. The state will begin placing the higher-limit signs on July 5.
(Excerpt) Read more at thenewspaper.com ...
Agreed. Most people in urban areas waste many gallons sitting stopped in traffic! This will save me my personal time and money in the long run.
Highway gas mileage stickers are based on an EPA test conducted on what amounts to a treadmill at an average speed of 48mph. There is no air resistance and unrealistic rolling resistance. Accessories such as AC are off. Acceleration is limited to about 3mph per second, or 0-60 in 18 seconds. To try and account for these inadequacies, results are then tweaked downwards by an arbitrary 22% irrespective of model.
The test is so divorced from actual driving as to be absolutely meaningless to the consumer, and the occasional instances where EPA numbers match real driving are purely coincidental.
Actually, unless my speedometer is way off, they are averating 75 mph on 380 right now on sunday afternoon. I also noticed that during weekdays it's even faster.
Driving across Texas at 65 mph is not a trip. It's a career.
Very outdated information from the 70's compiled from biased testing. In the 70's a car doing 60 mph was turning around 3500 rpm's or higher. Today my SUV will do 75 mph without going over 2100 rpm's.
During the summer I drive to work from the lake quite often. Traffic in the fast lane moves consistently at 75 to 80 mph and see almost no unsafe driving incidents. About once a week someone will hang in the fast lane doing 68 mph and all hell breaks loose. You see more unsafe driving incidents in 10 minutes than you see in a week at the higher speeds.
Recent studies show that the safest traffic pattern on non-urban highways is when the lanes move at the speed which 80% or more of the drivers want to travel at. Traveling at other rates of speed increase tension, increase reaction time and promote compulsive actions.
No there are not.
I drive Dallas to Shreveport about once a month, but I use US 80 out to MP 500 and pick up I-20 there. The limit has been 60 or 65 on the US 80 and even part of I-20 for several years. I rarely see more than one vehicle pulled over anywhere.
I drive a 1995 Toyota 4WD pickup, 3 liter V-6, manual 5-speed, 113,000 miles. For years I drove 70-75 on this run, but since gas passed $2, on the last couple of trips I tried to hold 65, hard to do exactly without cruise control, but I'm now actually seeing 20 mpg rather than 18.5. I have replaced the cat converter with an aftermarket one that probably causes less back pressure, and it also got me through the Dallas area emissions inspection with a much better score than last year's squeak-by with the original stock one.
My trip now takes me 15 minutes longer, but if I start 15 minutes earlier, it works out the same, right?
65 at night.
I was passed at night on I-10 between Beaumont and Houston doing 85, and the speed limit at night was 70 (75 in day). 100+mph driving will become more and more commonplace. Not that I have a problem doing so safely, but too many other drivers (regardless of age) are not as compotent behind the wheel as I am...
Modern hell? My 83 Cutlass has a '73 455 in it with an overdrive tranmsission and on the highway I get 26 mpg going 75-80mph.. It drops to 20-22 mpg in the 60-65 mph range. Of course I don't have steep rear gears (2.21 open rear).
Actually, and I can find the link if you like, the EPA hwy mileage ratings are based on a loop that involves some speeding up and slowing down, and a top speed of 55. The test simulates a 10 mile trip and averages 48 mph. At steady speeds, like out on the interstates in rural areas, especially with the cruise control set, many cars can do better than the EPA hwy ratings at speeds of 65-75.
WHy don't they do the thick concrete for road construction nationwide (at least on interstates)? I know down in Louisiana they do, and they don't have to do much road work other than lane widening or bridge work but once every ten years or so, even with all the trucks on the road. This asphalt stuff may be cheaper, but I think with all the $$ poured into that, it would save to do concrete.
Auxillary transmission coolers are a snap to put on. just bypass the line out from the radiator for the fluid from going straight back to the transmission, go to the cooler, and out from there back to the transmission. Or if you don't want it to be tied to engine temperature at all, just run it directly bypassing the radiator altogether both ways(however running it through the radiator first helps in winter). I have run my 455 powered Cutlass w/ a 2004r overdrive (a transmission that three shops told me should not be behind a big block) regularly up and down the highway, some at 90+ mph, as well as some thrilling 1/4 mile runs, some sanctioned at tracks some well, i plea the fifth, and the only thing ever to go wrong is I had to replace a defective 2nd gear band... But guess what, I still get 26 mpg hwy in the speed range everyone practically drives at...
What do all 4 have in common? Lots of New Yorkers and ex-New Yorkers.
That's what deer/animal horns are for. Take the critter factor out of the picture...
Power to weight ratio has a lot to do with it too. If you have relatively high power vehicle with a relatively low weight (12-15 lbs per hp), as long as it is not geared too steep or accelerating too hard to get up to speed, decent fuel economy is essentially a given, and while youre right wind resistance does increase geometrically, it doesn't overcompensate for a decent power/weight ratio in detracting from fuel economy. Add the higher speed/fuel efficency powerband, and the fuel efficency factor is not adversely effected by speed unless you are way up there in velocity, like 95+mph or more.
From Nashville TN to Baton Rouge, LA, going I-40, I-55, and I-12/10, doing 65 on the trip down I averaged 20.98 mpg. From Baton Rouge back to Nashville, I did 75-85 most of the way, depending on where I was (didn't do much over 80 in TN for fear of the lawman), and I got 26.35 mpg.
Simple solution Mr Diddle E Squat -- Stay out of the left lane and leave it for those that are passing.
Now why would you waste time and money on a part that drags down gas mileage..
The limit might be high, but I have never been in the Chicago area when anyone was able to go the speed limit because of congestion.
One summer day a few years ago, I was on 465 headed west to I65 (no 865 then) and was going 80 mph just to keep from getting run over. This was about 3:30 in the afternoon, so traffic was starting to pick up.
About the time I got to Michigan Road, I saw an Indy cop had someone pulled over--while the rest of us continued to fly by. How the h*ll the cop picked this guy out of all of us to ticket, I will never know.
Orange to El Paso - 803 miles.
Dalhart to McAllen...1108 miles
Why does Missouri, a hilly state have a 70 mph limit, while Illinois (aka boring-flat-as-a-pancake-state) have a 65 mph limit?!
After 100 mph in the Civic, I have to concentrate hard. It's quite tiring, actually, to sustain that amount of concentration for very long. But I did get from Mobile to Tallahassee in 3 hrs once. That's an average of 80 mph. In Atlanta I routinely drive over 80 dang near out of necessity.
I'm NOT complaining about safety at all. Would just like to see a new study of the fleet to find the average most efficient speed and go with that.
Please don't get me started on those kind of drivers :)
One of them danged near put me in a ditch yesterday.
About two years ago, in a settlement with EPA, they tried to force a 55 mph speed limit for Houston and the surrounding suburban counties. To show the appropriate emissions savings they used EPA's modplan IV. This was an outdated plan. However, using modplan V showed no savings and using the very newest plan showed a degradation. The particular emissions measured are directly proportional to the amount of fuel burned. Ergo, EPA's latest figures show increased fuel consumption when speed is reduced from 70 mph to 55 mph. Houston Metro area Speed limits are back up to 70 mph.
Frankly, I think the only safe place to go at top speeds are in rural areas like Wyoming and Montana without much other traffic and with safe vehicles and tires. I'm concerned about these trucks as well. I'm perfectly happy at 65-70 mph. It also saves fuel. We'll see.
There are other major factors beside wind resistance at play, and if you only look at one factor of course you will get the wrong impression. The efficiency of an engine can vary dramatically across its range, with the optimally efficient speeds being set by the design engineers -- even taking into account wind resistance.
To put it another way, the increase in wind resistance from 60 MPH to 70 MPH is less than the differences in effective output and efficiency of the engine in that same range. Wind resistance is far from being the whole story.
The whole point of diesel-electric rigs or hybrid engines is that the engine can always be running at its optimal efficiency point by decoupling engine output from motion on the road. Even given the significant losses in two-stage conversion process, the much higher efficiency of the combustion engine running optimally more than compensates.
There are several intersections along Interstate 10 between Van Horn and Sierra Blanca. This is the first one of them. This section of Interstate 10 is among the least traveled of the highway's length across the southern tier of the country. (Photo taken 3/14/04)
There is a picture of a yellow diamond-shaped sign clearly denoting an intersection on I-10.
Eenie, meanie, minie.. moe...
nyuck, nyuck, nyuck...
They give people tickets for passing on the right, and for driving in the left (passing) lanes. We should do that here and we could make our roads much safer. It is much more organized to drive in Europe where everyone is keeping right except to pass.
In Florida I'd be fraid of rubber gators much less real ones for high speed fun runs.....not to mention the little gators in court..........LOL !
If ya have a system to beat the DPS speed traps share it if ya will .....
I have a friend that is stuffing a viper engine in a dodge magnum station wagon. He go the body in a semi dented condition cheap and just "bought" the viper engine outright. It is IMHO the current day version of the old Nomad. When he's done I'll post a few pictures.
75-80 is about the max I feel comfortable driving in my Full Size van.. any more than that, and one big gust of cross wind can send you half a lane over....
Even in my car, I'd say about 80/85 is my comfort limit.. car can do well over it, but not a speed I would cruise at.
It's true, for the reason I mentioned. It's just another way of their saying they're not going to stop writing tickets for a few weeks just because the speed limit went up.
We'll see :)
Reminds me of the stupid signs some states put on their freeways: "SLOWER TRAFFIC KEEP RIGHT." Obviously, some left-lane squatters read that to mean it applies only to traffic SLOWER THAN ME.
"KEEP RIGHT EXCEPT TO PASS" seems a whole lot smarter, and less open to interpretation.
If you want on the list, FReepmail me. This IS a high-volume PING list...
Power to weight ratio doesn't effect fuel economy at cruising speeds. Power to weight ratios are a determining factor in the fuel burned to reach that speed.
People allow others to pass ny getting the heck out of the left lane. If more jerks would move right to allow faster traffic by, the roads would be safer for all concerned. That's how it works on the Autobahn.
I would have no problem felling comfortable at 100 mph in my Crown Vic, as long as traffic around me was at a relatively similar speed.
I have driven consideably faster than that, but conditions were right for it.
Have you been on I-10 between Houston and San Antonio? Once you get past the greater Houston area (read past Katy) 85-90 is about normal. They don't play and they move over when someone is approaching.
100+ in a Crown Vic? No way... sloppy feel of the steering in one of those babies... unless they've improved that greatly... Just way too easy to oversteer in one of those base fresh off the assembly line. Maybe if it has a sports package that inproved road feedback and feel....
I can and have done well over 100mph, but on a public road in traffic, 80ish is tops for me... of course if I lived out west where the Highways are all flat and straight and drone on forever I might be more comfy at higher speeds... here, where you are going around, over or through a mountain to get anywhere, 80's is fine.
My BS meter is pegged. Maybe it needs recalibration. I know someone's recently been pushing the idea that, for every 1 MPH over 55, it's like adding a nickel to the price of a gallon of gasoline (which is just a way of quantifying the point that fuel economy is worse). Obviously, that's intended to be a very rough average.
Seems to me that the optimal state for fuel economy is the slowest speed at which the engine is turning "relatively effortlessly" in the highest gear. I could be wrong but, it seems like for most modern cars, on flat terrain in no wind, that's between 40 and 50 MPH.
I think that's where my cars with trip computers show their highest fuel economy readings. At any rate, you've given me reason to check. And, I understand those trip computers don't really measure MPG. Mine have proved to be fairly close, though.
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