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Recent posts
#1
Sports / Re: NFL (2024 Season)
Last post by JayhawkCO - Today at 09:34:45 PMAnd surely the only difference between the two seasons is the QB, right?
#2
Off-Topic / Re: Minor things that bother y...
Last post by LilianaUwU - Today at 09:32:01 PMQuote from: D-Dey65 on April 25, 2024, 09:08:07 AMDoes anybody know anything about the feud between "AAARoads" and "Horse Eye's Back" on Wikipedia? Because "Horse Eye's Back" is tagging a lot of articles as not meeting the General Notability Guidelines, even lists of roads.Whoever AAAroads is, they're most likely a sockpuppet of someone who has attacked Horse Eye's Back in the past, and they're not affiliated with AARoads or the wiki in any way.
#3
Canada / Re: Ontario's Highways
Last post by LilianaUwU - Today at 09:27:13 PMQuote from: vdeane on Today at 12:55:01 PMNow if only Québec would get on board...That's what I've been saying, but that's probably never gonna happen.
#4
Traffic Control / Re: 1-2-3 Route number Additio...
Last post by hotdogPi - Today at 09:25:02 PM1466 = FM 1276 + US 190 by formulanone
#5
Off-Topic / Re: Random Thoughts
Last post by formulanone - Today at 08:44:15 PMQuote from: jlam on April 15, 2024, 11:34:51 PMQuote from: Hunty2022 on April 15, 2024, 12:40:48 PMToday marks one year since I converted to taking horizontal road pictures.
The only way to take road pictures. There's typically much more to look at on the sides of the road than in the sky.
Sometimes horizontal works out, but it's a matter of personal taste...
...but maybe 1-of-500 of my road shots are taken in portrait orientation. Roadside signage is a mix, but if I want the road an
#6
Sports / Re: NFL (2024 Season)
Last post by SEWIGuy - Today at 07:45:52 PMPrescott, Tua, Goff, Purdy, Murray and Rodgers are not better than Jordan Love. That's a laughable take.
There isn't a Packer fan in the world that would take Rodgers back over Love. Anyone could see the offense was 100x better last year.
There isn't a Packer fan in the world that would take Rodgers back over Love. Anyone could see the offense was 100x better last year.
#7
Off-Topic / Re: Random Thoughts
Last post by Big John - Today at 07:42:57 PM^^ The first paragraph was the premise of the TV show Undercover Boss.
#8
Sports / Re: NFL (2024 Season)
Last post by JayhawkCO - Today at 07:29:23 PMI watched him plenty last year. We'll obviously agree to disagree.
#9
Off-Topic / Re: Random Thoughts
Last post by ZLoth - Today at 07:26:07 PMAfter doing some work around the house, I got this evil thought... why not have a TV series where we see these highly-paid/highly-visible celebrities and business leaders do some "menial" tasks like clean a pool, change the oil, change the sheets on their bed, do simple repairs, and so on. I wonder if they even still know how to do the ordinary things, or if they are left flummoxed.
Along the same lines, I would like to see the folks who design some of the newer vehicles actually try fixing some of the simpler stuff, like replace a headland on a car, change the oil, change the battery, or even change some of the turn signal or brake lights. This was brought about a few years ago on a previous vehicle when I was replacing the headlight on my car. Right headlight... no problem, but the left headlight required that I remove some parts to get to the bolts that held that headlight.
Along the same lines, I would like to see the folks who design some of the newer vehicles actually try fixing some of the simpler stuff, like replace a headland on a car, change the oil, change the battery, or even change some of the turn signal or brake lights. This was brought about a few years ago on a previous vehicle when I was replacing the headlight on my car. Right headlight... no problem, but the left headlight required that I remove some parts to get to the bolts that held that headlight.
#10
Southeast / Re: I-40 in North Carolina
Last post by jdunlop - Today at 07:22:50 PMBoth the DDI and SPUI work best when there's heavy ramp traffic. That's why the DDI is typically an easy replacement for a SPUI.
Definitely wouldn't do a SPUI just for heavy through traffic. They are useful for heavy overall traffic (such as Brier Creek Parkway/US 70, which was discussed previously.)
My quick rule of thumb for DDIs when we first considered them is if the ramp traffic took up more than 50% of the signal timing. The idea is that with a DDI, the through traffic is basically limited to 50% of the green time at the crisscross intersection (assuming a relatively even volume split on the surface street.) So, if the ramp traffic took more than 50%, a DDI would give back time to the through street. (It wasn't a warrant to install, just to consider it.)
With the DDI, you also have to consider off-peak periods, and whether the negative phasing impact for light traffic (ramp traffic less than 50% of signal time) is worth the positive impact during peak periods. With advanced simulation, that's now easier to calculate, and provide additional data to make the decision about whether or not to put a DDI in.
For retrofits where you can reuse the existing bridge(s) and little modification is needed to the ramps, then the DDI is a great, relatively inexpensive, fix. For new locations or ones where the entire interchange has to be rebuilt, that opens up other options that very often will be better than a DDI. (A Parclo B, as I believe I mentioned earlier.) However, off ramp loops (typically a single lane exiting) has a capacity limit of about 1300 vehicles/hour, which would likely kill that as an option, opening it back up for DDIs. A left off a DDI can handle a lot more than that - a single lane "straight" exit's capacity is around 2000 v/h, plus it's easier to provide multiple lanes exits and making the left turn.
Definitely wouldn't do a SPUI just for heavy through traffic. They are useful for heavy overall traffic (such as Brier Creek Parkway/US 70, which was discussed previously.)
My quick rule of thumb for DDIs when we first considered them is if the ramp traffic took up more than 50% of the signal timing. The idea is that with a DDI, the through traffic is basically limited to 50% of the green time at the crisscross intersection (assuming a relatively even volume split on the surface street.) So, if the ramp traffic took more than 50%, a DDI would give back time to the through street. (It wasn't a warrant to install, just to consider it.)
With the DDI, you also have to consider off-peak periods, and whether the negative phasing impact for light traffic (ramp traffic less than 50% of signal time) is worth the positive impact during peak periods. With advanced simulation, that's now easier to calculate, and provide additional data to make the decision about whether or not to put a DDI in.
For retrofits where you can reuse the existing bridge(s) and little modification is needed to the ramps, then the DDI is a great, relatively inexpensive, fix. For new locations or ones where the entire interchange has to be rebuilt, that opens up other options that very often will be better than a DDI. (A Parclo B, as I believe I mentioned earlier.) However, off ramp loops (typically a single lane exiting) has a capacity limit of about 1300 vehicles/hour, which would likely kill that as an option, opening it back up for DDIs. A left off a DDI can handle a lot more than that - a single lane "straight" exit's capacity is around 2000 v/h, plus it's easier to provide multiple lanes exits and making the left turn.