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morning backup at Park and Walbridge

 
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Subcity



Joined: 17 Mar 2010
Posts: 190

PostPosted: Mon Feb 13, 2012 2:30 pm    Post subject: morning backup at Park and Walbridge Reply with quote

This doesn't affect my morning commute, but this morning I did see the big backup on westbound Park Road, from the light at Walbridge.

I think the left-turn light from Klingle, as implemented, is stupid. But assuming it's there for the duration, I have a suggestion:

What if that left turn/left-turn light were prohibited/disabled during rush hour?

Again, the backup doesn't cause a problem for me, but just seeing that this morning, it seems absurd to shorten the westbound Park Road traffic for 20 seconds (?) each cycle and thereby backup traffic for that rare person who wants to turn left there from Klingle.

The inevitability of unintended consequences.

From a cost-benefit standpoint, is that left turn really worth the cost of that severe backup each weekday morning?

At present, and as far as I know, Park is the only westbound artery in our area. Screw that up to accomodate a few people who want to turn left every day? BTW, I've been in Mt P for >25 years and in all that time have seen maybe 5 people take that turn.

Again, what route does the DDOT want drivers to take, east to west? Based on the current arrangement, the answer seems to be: We don't want people driving in that direction at all.

For in and out of town, you have 14th, 15th, 16th. But what about heading cross-town? No arteries.

Of course, someone on Klingle who wants to head down Park at rush hour there could loop around onto Walbridge - effectively making a "jug-handle" left turn as it's called in some parts of the country.

Indeed, I think a jug-handle left should be the only way to do this maneuver and that left turn signal should be yanked.
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micmac



Joined: 22 Mar 2005
Posts: 354

PostPosted: Mon Feb 13, 2012 6:01 pm    Post subject: Reply with quote

I take a left hand turn on Wallbridge almost every day heading towards Adam Morgan or Dupont Circle. It is a relief not to worry about a head on collision with someone speeding up Klingle, there is poor visibitliy for both drivers.
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Subcity



Joined: 17 Mar 2010
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PostPosted: Mon Feb 13, 2012 11:24 pm    Post subject: Reply with quote

micmac wrote:
I take a left hand turn on Wallbridge almost every day heading towards Adam Morgan or Dupont Circle. It is a relief not to worry about a head on collision with someone speeding up Klingle, there is poor visibitliy for both drivers.


I've long thought that that should be resolved by DDOT installing a left-turn signal at Adams Mill. Even without that, the visibility is better and there's the right-hand lane for thru-traffic.

The thing is, if DDOT installs a dedicated light cycle for this turn and that turn and the other turn, traffic will back up -- as is the case now.

Before the new light arrangement, for anyone concerned about taking a left turn from westbound Park to Walbridge, I wonder how many traveled the few extra yards down to Adams Mill to make the turn where the visibility is fine?

Again, Park Rd was supposed to be a main westbound artery and yet the situation has been so screwed up by the new light that there's a huge backup in the mornings - at least it now seems to be that way.

In any event, I thought the left-turn signal for eastbound Klingle was installed to allow left turns onto Park, not to resolve an issue for drivers headed westbound on Park Rd.
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jack



Joined: 23 Mar 2004
Posts: 4399
Location: 19th & Lamont

PostPosted: Tue Feb 14, 2012 9:30 am    Post subject: Klingle/Walbridge/Park Road intersection Reply with quote

micmac wrote:
I take a left hand turn on Wallbridge almost every day heading towards Adam Morgan or Dupont Circle. It is a relief not to worry about a head on collision with someone speeding up Klingle, there is poor visibitliy for both drivers.


That's a good point, generally overlooked in this discussion: that westbound traffic from Park Road onto Klingle is expedited by the dedicated-green phase of the traffic light. Drivers continuing straight onto Klingle aren't slowed by drivers turning left onto Walbridge, and stopped for oncoming traffic.

I don't think the dedicated-green arrangement for eastbound Klingle was necessary, but DDOT insisted. It was necessary to make some arrangement for traffic going from eastbound Klingle onto Park Road. Too many such drivers did that by turning right onto Adams Mill, left into the alley, through the alley and out onto Walbridge. No doubt it would be safer to go to the Adams Mill/Walbridge intersection and take a left, but that wasn't popular, not only because of the greater distance, but because of congestion delays at that intersection.

-- Jack
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Subcity



Joined: 17 Mar 2010
Posts: 190

PostPosted: Tue Feb 14, 2012 2:13 pm    Post subject: Re: Klingle/Walbridge/Park Road intersection Reply with quote

jack wrote:
No doubt it would be safer to go to the Adams Mill/Walbridge intersection and take a left, but that wasn't popular, not only because of the greater distance, but because of congestion delays at that intersection.


I vaguely recall that the stop sign on Adams Mill at Walbridge is a somewhat recent addition. Is your comment about "congestion delays" about the situation only before the stop sign on Adams Mill was added, or even now?

In any event - and I am not disagreeing - I can't envision what sort of "congestion delay" might be involved.

Overall, there clearly are collateral effects to each of these decisions and it seems to me that the full impact is a major decrease in traffic flow - especially westbound on Park Rd in the AM.

At some point I wish the powers-that-be would understand that if, for example, they do something to slow traffic on one road, the result may not simply be all the same drivers driving on that road at a slower speed. Indeed, some number of drivers will take some other route.

Unfortunately - and this is merely my hunch - it does not seem that DDOT considers the collateral impacts and gets them wrong. Rather, it seems that they don't even consider such collateral impacts.

If just for once I would see some change that offered better traffic flow, I might think otherwise. But I have never seen such a change - Not one change to allow more traffic to flow at a safe speed along some stretch of road.

Correction: I have seen one such change to improve traffic flow - The left-turn signal at westbound Porter, to southbound Connecticut. Yes, that slows eastbound traffic on Porter at Conn Ave, but that westbound left turn is effectively the only way to get to Conn Ave south of Porter. IOW, if it were merely a bit-more-convenient way to get there, it might not be justified in light of the backup on eastbound Porter during PM rush hour.
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jack



Joined: 23 Mar 2004
Posts: 4399
Location: 19th & Lamont

PostPosted: Wed Feb 15, 2012 9:50 am    Post subject: Re: Klingle/Walbridge/Park Road intersection Reply with quote

Subcity wrote:

I vaguely recall that the stop sign on Adams Mill at Walbridge is a somewhat recent addition. Is your comment about "congestion delays" about the situation only before the stop sign on Adams Mill was added, or even now?

In any event - and I am not disagreeing - I can't envision what sort of "congestion delay" might be involved.


The stop signs on Adams Mill at Walbridge were put there in 2003.

"Congestion" is perhaps the wrong word. I mean simply that going to Walbridge and taking the left is not only a longer route than the cut through the alley, but one does have the stop, and perhaps a wait for traffic from the other two directions. The consequence is that drivers in a hurry prefer the alley cut-through.

Subcity wrote:

Overall, there clearly are collateral effects to each of these decisions and it seems to me that the full impact is a major decrease in traffic flow - especially westbound on Park Rd in the AM.


I don't know if it's a "major decrease" or not. That intersection has always been slow, and morning westbound traffic gets backed up. That's why my alley is afflicted with rather fast-moving traffic every morning. Pulling my car out of my garage is always an adventure in "is anyone coming, or not?"

Subcity wrote:

At some point I wish the powers-that-be would understand that if, for example, they do something to slow traffic on one road, the result may not simply be all the same drivers driving on that road at a slower speed. Indeed, some number of drivers will take some other route.

Unfortunately - and this is merely my hunch - it does not seem that DDOT considers the collateral impacts and gets them wrong. Rather, it seems that they don't even consider such collateral impacts.


That's what I've been telling them for years, without much effect. The problem isn't so much DDOT as it is the politicians, responding to demands from residents that traffic in front of their houses be slowed down. That's why you see stop signs popping up all over the place. Not because traffic engineering advises them, but because residents want the traffic to be "calmed".

I deal with complaints all the time about excessive speed on Park Road, and on Walbridge Place. One of my first ventures into neighborhood politics dealt with demands to slow traffic on Irving Street. DDOT responded by proposing stop signs at every intersection along Irving -- at Hobart, at 18th, at 17th. I did a little community action to shoot down that really bad idea.

Re politicians, Councilmember Graham has earned a reputation as "mister stop sign".

Some time ago I pressed DDOT to synchronize the lights on Klingle, so that eastbound traffic released by the Adams Mill light would encounter a green at Walbridge. Jim's response was puzzlement, that I was asking for lights to be synchronized to promote efficient traffic flow, instead of asking for intentionally contrary timing to make them stop at every intersection. The latter is what he gets from residents, and DDOT then does as they're told, much as they dislike doing traffic design according to political demands, not traffic engineering considerations,

Subcity wrote:

If just for once I would see some change that offered better traffic flow, I might think otherwise. But I have never seen such a change - Not one change to allow more traffic to flow at a safe speed along some stretch of road.


I did get the Klingle lights changed to reduce the double stop. For a long time, the light timing was perverse. The Adams Mill light would go green, but the Walbridge light would then go red just before you could get there, so you had a long wait at the Walbridge intersection. It's not perfect now, but it's much better than it was.

Subcity wrote:

Correction: I have seen one such change to improve traffic flow - The left-turn signal at westbound Porter, to southbound Connecticut. Yes, that slows eastbound traffic on Porter at Conn Ave, but that westbound left turn is effectively the only way to get to Conn Ave south of Porter. IOW, if it were merely a bit-more-convenient way to get there, it might not be justified in light of the backup on eastbound Porter during PM rush hour.


Speaking of Porter Street -- there's another place where residents have demanded measures to restrict traffic flow. They got the stop sign, and a midblock traffic light, triggered by anyone going over about 30 mph. And I recall one resident asserting proudly that he would hit the pedestrian crossing button whenever he passed the light, not because he was crossing the street, but just to annoy the passing traffic.

This city just wasn't designed for so much automobile traffic.

-- Jack
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Subcity



Joined: 17 Mar 2010
Posts: 190

PostPosted: Wed Feb 15, 2012 11:58 am    Post subject: Reply with quote

Jack, thanks for the detailed comments. Very informative.

Here's something that baffles me - and that's being polite (to DDOT): Since when does "traffic-calming" require mis-timed traffic lights?

TIMED traffic lights can calm traffic. When the lights on 15th St were perfectly timed, they were timed for cars traveling within the speed limit. You could drive from Rhode Island to Harvard St without ever having to brake. If you drove too fast, you'd have to brake for red lights.

That was also true for the lights on Irving St.

Oh, or here's an idea: Time all the lights on 15th St to fit the speed limit and string speed-enforcement cameras. Then, those who obey the speed limit will be able to travel efficiently and those who speed will get tickets.

In other words, why make traffic inefficient for all in order to coral the outliers?

(Sorry for the possibly mixed metaphor. Also, to be clear, I am not directing this at you, Jack.)

It's my understanding that, in the 1970s, early programs to control traffic lights electonically had two goals: (1) Improve traffic flow and (2) slow traffic to the speed limit. Anyone who thinks you need to mis-time traffic lights to limit speeds is ill-informed. And if that person is employed by DDOT, it seems that s/he is incompetent.

When I worked on Capitol Hill in the 1980s, every morning I'd drive east on Irving and every night I'd drive north on 15th Street and the timing of traffic lights on both streets regulated my speed and allowed me to drive without stopping. Somehow, it appears, powers-that-be decided that if cars can motor along without stopping block after block after block, then that necessarily means those cars are speeding. That is not correct.

I'd like to see a "traffic calming" study that properly times lights for 25 MHP and puts up big signs - "Lights Timed for 25 MPH". Maybe add-in some speed indicators (or whatever they're called) that say, "Your speed is ___".

When the pedestrian traffic-light countdown timer displays were installed, some people said that they would encourage speeding. At the time, seemed like a reasonable possibility and something that deserved consideration. Yet, seems to me they've encouraged people to slow down. When there were no timers, I might speed up a bit in the hope that I'd made the upcoming light. But now, with the timers, I can see how much time remains and immediately know if there's enough time for me to make the light or not. It calms my driving by calming me with the information I need.

In other words, "traffic calming" should not be seen as requiring traffic-stopping. If you calm the drivers, you can calm their driving even as they drive without stopping.

Providing drivers with information and a synchronized system of lights can achieve both enhanced traffic flow as well as enhanced traffic and pedestrian safety. The challenge is to get DDOT and the elected officials who oversee them to understand this.
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jack



Joined: 23 Mar 2004
Posts: 4399
Location: 19th & Lamont

PostPosted: Wed Feb 15, 2012 12:29 pm    Post subject: Traffic Reply with quote

Subcity wrote:
Jack, thanks for the detailed comments. Very informative.

Here's something that baffles me - and that's being polite (to DDOT): Since when does "traffic-calming" require mis-timed traffic lights?


I know, I know . . . this frustrates me very much. The resident who demanded intentionally mis-timed lights on Irving was (and remains) an ANC 1A commissioner. Our Councilmember tends to listen to such people (including me, and for that I'm grateful). Then traffic measures are taken to please the Councilmember, and his constituents, not because these measures make traffic engineering sense.

DDOT hates this, and I've heard of at least one good DDOT engineer who asked to be transferred out of our ward, because he objected to having traffic decisions made on the basis of politics, not engineering. Evidently Jim Graham's been especially forceful at this. As I said, he's "mister stop sign".

Which brings to mind the stop signs right at my house, on 19th Street, at Lamont. Those appeared one day some years ago, before my ANC thing began. It turns out that one resident of my block requested stop signs, presumably because she thought that would make crossing 19th Street at Lamont safer. That single request was all it took. Nobody asked any other neighbors if they wanted the stop signs.

That one resident has long since moved away, but the stop signs remain, justified or not, forever. There's a ratchet effect to traffic control measures. Once in place, nobody ever checks back to confirm that they're really appropriate. It's assumed that the stop sign, or whatever, was imposed for good reason, and that's that, even if nobody can recall what that reason was. (DDOT doesn't keep records of the reasoning behind any of these measures, so once personnel move on, the reasons are forgotten.)

About those multiple stop signs proposed for Irving Street, back in 2002 -- this ANC of that time, in its traffic-engineering innocence, endorsed that proposal. Sure, make the traffic stop and start at every block, just to keep it slow. Somebody thought it was a good idea, the ANC went along with it, and DDOT was going to do it, until I got in the way.

Permit traffic to move smoothly and expeditiously on the arterial routes, and there won't be so much cut-through traffic on side streets and in our alleys. That's my philosophy. But residents of the arterials want that traffic slowed, as if our arterials are to be treated as residential streets, not arterials. There's the problem.

-- Jack
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