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Author Topic: District of Columbia  (Read 206404 times)

cl94

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Re: District of Columbia
« Reply #900 on: December 14, 2018, 01:31:14 PM »

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Alps

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cpzilliacus

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Re: District of Columbia
« Reply #902 on: December 16, 2018, 08:22:46 PM »

Apparently not. :(

Were you able to access it?
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MNHighwayMan

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Re: District of Columbia
« Reply #903 on: December 17, 2018, 09:18:35 AM »

Apparently not. :(
Were you able to access it?

Here's an Imgur rehost of the image in question, if anyone's still having trouble. I was able to access the second link.

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jakeroot

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Re: District of Columbia
« Reply #904 on: January 05, 2019, 04:58:49 PM »

I was walking around a couple days ago, and noticed all the construction between 6 St SW and 4 St SW, south of Independence. Looks like they're installing an Eisenhower Memorial?

I see on Street View, Maryland Ave SW (which used to run through there) once had a rare triple-lane yield where it met Independence (though two + parking most of the time). Not sure I've seen that anywhere else before. Anyone know if Maryland Ave was realigned between 6 and 4 St? Old satellite imagery seems to show an old alignment apparently re-purposed partly for parking.
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froggie

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Re: District of Columbia
« Reply #905 on: January 05, 2019, 10:00:33 PM »

^ Based on aerial imagery, the recent (pre-existing-construction) configuration dates back at least to 1964.  While the parking area you're referring to is technically along the street line, it was an add-on that came after westbound Maryland was realigned to come directly off Independence.  There was a time period in between where whatever former pavement existed in the parking area had been obliterated, then rebuilt as a new parking area before 1964.
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jakeroot

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Re: District of Columbia
« Reply #906 on: January 05, 2019, 11:33:25 PM »

^ Based on aerial imagery, the recent (pre-existing-construction) configuration dates back at least to 1964.  While the parking area you're referring to is technically along the street line, it was an add-on that came after westbound Maryland was realigned to come directly off Independence.  There was a time period in between where whatever former pavement existed in the parking area had been obliterated, then rebuilt as a new parking area before 1964.

Thanks for the info! The way Maryland hits Independence on both sides of 4 St, definitely doesn't seem like a setup that would have been common after the 60s (large paved area, no signal control), so that all makes sense.
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mrsman

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Re: District of Columbia
« Reply #907 on: January 06, 2019, 01:35:13 PM »

^ Based on aerial imagery, the recent (pre-existing-construction) configuration dates back at least to 1964.  While the parking area you're referring to is technically along the street line, it was an add-on that came after westbound Maryland was realigned to come directly off Independence.  There was a time period in between where whatever former pavement existed in the parking area had been obliterated, then rebuilt as a new parking area before 1964.

Thanks for the info! The way Maryland hits Independence on both sides of 4 St, definitely doesn't seem like a setup that would have been common after the 60s (large paved area, no signal control), so that all makes sense.

As originally laid out (in L'enfant's day), MD-Ind-4 1/2 St was a 6-way intersection in a similar manner to PA-Constitution-4 1/2 St a few blocks to the north.  In both cases, the streets were later simplified to avoid the 6-way intersection to simplify traffic patterns.  For the northern intersection, Constiution was split into two parts with PA being the thru street and the northern section of 4th closed to traffic as part of Judiciary Square.  For the southern intersection, Maryland was split into two parts in order to avoid all 3 streets coming together at the exact same intersection.  At the time this was done, the transportation authority realized that due to the railroad and the capitol, there was very little thru traffic on MD, so some of the excess space in the roadway was relegated to parking.

And now the've closed the whole block south of Independence altogether for the Ike memorial.
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ixnay

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Re: District of Columbia
« Reply #908 on: January 06, 2019, 04:31:26 PM »


And now the've closed the whole block south of Independence altogether for the Ike memorial.

A monument I didn't know about until this morning, courtesy of this thread.

Here's a link... http://www.eisenhowermemorial.org/

ixnay
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jakeroot

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Re: District of Columbia
« Reply #909 on: January 07, 2019, 02:36:25 PM »

^ Based on aerial imagery, the recent (pre-existing-construction) configuration dates back at least to 1964.  While the parking area you're referring to is technically along the street line, it was an add-on that came after westbound Maryland was realigned to come directly off Independence.  There was a time period in between where whatever former pavement existed in the parking area had been obliterated, then rebuilt as a new parking area before 1964.

Thanks for the info! The way Maryland hits Independence on both sides of 4 St, definitely doesn't seem like a setup that would have been common after the 60s (large paved area, no signal control), so that all makes sense.

As originally laid out (in L'enfant's day), MD-Ind-4 1/2 St was a 6-way intersection in a similar manner to PA-Constitution-4 1/2 St a few blocks to the north.  In both cases, the streets were later simplified to avoid the 6-way intersection to simplify traffic patterns.  For the northern intersection, Constiution was split into two parts with PA being the thru street and the northern section of 4th closed to traffic as part of Judiciary Square.  For the southern intersection, Maryland was split into two parts in order to avoid all 3 streets coming together at the exact same intersection.  At the time this was done, the transportation authority realized that due to the railroad and the capitol, there was very little thru traffic on MD, so some of the excess space in the roadway was relegated to parking.

And now the've closed the whole block south of Independence altogether for the Ike memorial.

Thanks for the info. Those six-way intersections definitely worked back when L'Enfant designed them, as they mostly shuttled unorganized horses and people, not cars. I can certainly see why things were changed, especially since DC's lights are all timed, and a six-leg intersection would totally throw off the grid.



I've spotted an issue with the Pennsylvania Ave PBL (so, an error that's been in place since around 2011). When the eastbound left turn signal is activated towards Constitution, the through signal on Pennsylvania is red, despite there not being any conflicting traffic or pedestrians. Because the cycle path uses through-traffic signals, the signal has to be red during the left turns because of the overlap with the cycle path.

They could easily fix this by creating a conflict (i.e. adding a crosswalk on the east side of the intersection), or by adding a bike signal that can run independently. Either way, right now, it's a dumb design, and I've witnessed traffic ignoring the red signal on many occasions (and I can't blame them as there is no conflict).
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