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re: Do Roundabouts work?
Posted on 11/7/18 at 5:47 am to Ponchy Tiger
Posted on 11/7/18 at 5:47 am to Ponchy Tiger
Way too many dumbasses have no clue how a roundabout works. One in Walker is the perfect example of that.
2
Posted on 11/7/18 at 5:49 am to tduecen
quote:
Way too many dumbasses have no clue how a roundabout works.
They have started installing them in Georgia all over the place. Mostly in small counties and roads. Its amazing watching older people try to navigate them.
Posted on 11/7/18 at 5:50 am to Arkapigdiesel
quote:I think one of the important factors in the success/failure of a roundabout is to install them on a stretch of road where the difference between the posted speed limit and the reduced speed of the roundabout is minimal.
I wish it were possible to replace every red light with one. Roundabouts are God’s answer to people like me who like to keep moving in traffic.
Posted on 11/7/18 at 5:51 am to tigerpawl
Yes studies have proven this
Posted on 11/7/18 at 5:56 am to LanierSpots
I can't count the number of times I've seen people ride in the middle of both lanes, come in flying and end up off the road, or get in the wrong lane then have to cut someone else off to get over. It is clearly marked everywhere.
Posted on 11/7/18 at 6:27 am to tduecen
Of all the roundabouts you've approached, does the signage clearly spell out that those already in the roundabout have the right-of-way?? Any exceptions? I would think the DoTD would not assume everybody already knows this.
Posted on 11/7/18 at 9:45 am to tigerpawl
The fact that it drops conflict points from 26 to 14 within the interchange is incredible. I think the video said it reduced collisions by over 50% which would be a godsend to people in Louisiana. With so many distractions for drivers these days, engineers need to be taking these factors into account and so their best to minimize collision opportunities and reduce the possibility of head on collisions whenever possible.
Also if you look around the 1:10 mark in that video, they diverging diamond they show in Fayette, Kentucky showed the DDI on an underpass. I wonder which configuration would be easierur cheaper to build? (Underpass DDI vs Overpass DDI)
Also if you look around the 1:10 mark in that video, they diverging diamond they show in Fayette, Kentucky showed the DDI on an underpass. I wonder which configuration would be easierur cheaper to build? (Underpass DDI vs Overpass DDI)
Posted on 11/7/18 at 9:55 am to tigerpawl
quote:
roundabouts
You people
:tinhat:
The roundabout is a corporate agenda. When the world moves to self-driving, vehicles will not have to apply brakes thereby severally increasing fuel efficiency. Acceleration from 0-25mph has the worst fuel efficiency, so for every roundabout you have 1,000's of pennies saved per day. The cost savings is extremely substantial on a daily basis when you expand that over the entire US.
Posted on 11/7/18 at 10:14 am to tigerpawl
quote:
Do roundabouts move traffic better than traditional 4-way stops or traffic light intersections?
Yes and they are not subject to power outages. I lived through six or 7 tropical storms and hurricanes when I lived in the Caribbean. It was so nice to not have to worry about traffic jams (i.e. BR for a month after Gustav in '08) after the storms. Just clear the debris from the roundabout and bam it works again. Every intersection in states that are in hurricane areas should be replaced with roundabouts.
Posted on 11/7/18 at 10:16 am to tigerpawl
Yes, but you will get fricking killed if the diameter is not large enough.
Posted on 11/7/18 at 10:17 am to tigerpawl
The roundabout at 1077/1085 came straight from God himself. That fricking garbage redlight made me feel bad for the poor souls that lived with that mess for years.
Posted on 11/7/18 at 10:33 am to taylork37
quote:
I don't have statistics
I do
quote:LINK
Roundabouts are safer than traditional intersections for one big reason: Fewer conflict points. Think about how many places traffic can cross paths at a signaled intersection. There are a lot — 32 to be exact. In a roundabout there are only eight such places, greatly reducing the potential for collisions [source: Nevada Department of Transportation, "Roundabout Benefits"].
What's more, their design, with one-way traffic and angled entry lanes, reduces the chance of dangerous T-bone or head-on collisions to zero. Roundabouts also have a slowing effect, forcing drivers to brake as they navigate around the central island and eliminating the impulse to speed up and beat a traffic light [source: Washington State Department of Transportation, "Roundabout Benefits"].
All these features can produce dramatic safety improvements. A 2000 study that looked at 24 newly constructed roundabouts across the United States revealed a 76 percent decrease in injury crashes, a 90 percent decrease in fatal or incapacitating crashes and a 39 percent reduction in overall crashes [source: FHWA, "Roundabouts"]. Pennywise city budgeters will also find a lot to love in roundabouts. While the cost to construct a roundabout is similar to that of a signaled intersection, the cost to maintain the circular intersection is much lower. Traffic lights cost about $5,000 to $10,000 in yearly maintenance and have a lifespan of 15 to 20 years. Compare that to a roundabout, which lasts about 25 years and has none of the hardware, maintenance and electrical costs of signals [sources: WSDOT, "Roundabout Benefits" and NDOT, "Roundabout Benefits"].
Of course, safety and cost savings are great and all, but it's the reduction in traffic congestion that gets the public most excited about roundabouts. With no stop signs or traffic lights to halt traffic, roundabouts promote a continuous flow of vehicles that can really reduce delays — anywhere from 13 to 90 percent depending on the intersection [sources: WSDOT, "Roundabout Benefits" and NDOT, "Roundabout Benefits"]. That's good news for Earth, too: Improved vehicular flow reduces fuel consumption and greenhouse gas emissions by 30 percent or more in some cases [source: NDOT, "Roundabout Benefits"]. And even if you did get delayed in a roundabout, at least you could admire the landscaping on the central island, an aesthetic improvement over the unbroken concrete in a traditional intersection.
10-90% congestion reduction and they save lives. The only downside is that stupid people like the drivers in Louisiana are not smart enough to figure out how to use them.
Posted on 11/7/18 at 10:41 am to tigerpawl
quote:
Of all the roundabouts you've approached, does the signage clearly spell out that those already in the roundabout have the right-of-way??
I followed the directions and stopped at a stop sign. Now, who gets to go first, cross traffic or I? I'm so confused! THE SIGN DOESN'T TELL ME!
This post was edited on 11/7/18 at 10:44 am
Posted on 11/7/18 at 10:52 am to TigerstuckinMS
There is no yield sign?
Posted on 11/7/18 at 10:54 am to Ronaldo Burgundiaz
Single lane roundabouts are fantastic
Posted on 11/7/18 at 11:06 am to Kujo
quote:
There is no yield sign?
IT'S JUST BIG AND RED AND SAYS "STOP"!
Posted on 11/7/18 at 11:13 am to tigerpawl
I was on vacation recently in a country that has a lot of them. It seemed that every intersection except those that tee had a roundabout in it and it was very smooth and keep traffic moving.
Posted on 11/7/18 at 11:30 am to MorbidTheClown
quote:
yes, when people understand how to use them
bingo
Plus, they must be applied under the right circumstances…..convergent volumes, etc.
Posted on 11/7/18 at 11:32 am to tigerpawl
quote:
Do roundabouts move traffic better than traditional 4-way stops or traffic light intersections?
Before the roundabout on Florida Blvd, I would have a break in traffic due to redlights and was able to pull out of my neighborhood fairly easy in the mornings...Since our roundabouts completion, there is literally a non stop flow of traffic in the mornings now and it takes a little bit of defensive driving on my part
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