Showing posts with label interchange. Show all posts
Showing posts with label interchange. Show all posts

April 08, 2010

More on the new alts for I-395/Seminary/BRAC-133

Last month, I described one of the new alternatives proposed by the BRAC Advisory Committee for the BRAC-133 project at I-395/Seminary Rd/Mark Center. But at the time, there were no online maps and all I had was a paper copy of the proposed concept.

After some further searching, I found this PDF on the city's website, which shows maps of the new alternative, also shown in the graphics below.




This first image shows the interchange concept in relation to the surrounding area. Of note are both the removal of the existing Seminary Rd flyover, and the traffic circles on Seminary at both the I-395 ramps and at Beauregard St. Both traffic circles are optional, but given the high traffic volumes both would likely have to be signalized even if they were built.




This second image shows a sketched out lane schematic, detailing the turn and through lane changes associated with the alternative. Note that, due to the removal of the existing Seminary Rd flyover, an additional lane each way is added along what is now the Seminary Rd ramps to I-395.


There's also a second alternative being suggested, which can be found on page 5 of this PDF.

Lastly, there's a PDF showing the wide range of conceptual alternatives originally considered for the project.

VDOT actually listens...

Yes, you heard that right...

It was reported at the end of last night's Alexandria Transportation Commission meeting that the city received a letter from VDOT about the BRAC-133 project (I-395 access at Seminary Rd/Mark Center). VDOT is apparently agreeing to not only drop Alternative A1 (which the city first supported, but more recently the BRAC Advisory Group opposed), but also Alternative D as well, which the city has long opposed due to its impact on the Winkler Preserve. VDOT also agreed to consider the two alternatives recently proposed by the BRAC Advisory Group (one of which I described after last month's meeting).

However, in true VDOT fashion, they're asking the city for money to further study these new alternatives. I didn't catch everything relating to how to fund that, but the city is looking at various sources to fund further study.

Still, this is a positive response from VDOT, who in the past (and as recently as last month's public hearing) tends to try to ramrod projects through.

March 12, 2010

VDOT's "this is what we studied" I-395/BRAC meeting

In a last-minute decision (over an hour into it), I went to the meeting anyway. Good thing too, because there were a few juicy tidbits I'd have otherwise missed.

The meeting setup was VDOT standard fare, with various posterboards set up, VDOT and consultant personnel standing around to answer questions, and a formal presentation (which I was too late for). There were boards showing the overall site layout:




Another board showing the basic design and street improvements for Mark Center Road:




But the bulk of the meeting was focused on the two alternatives that VDOT studied in depth and brought forward, A1 and D. With boards showing how they (and the other official alternatives) ranked against each other on the purpose/need and guiding principles:





The Alternative layouts themselves are available online.


As you can see, Alt D is a clear "front-runner" amongst the alternatives that VDOT studied. Unfortunately for them, Alt D impacts the Winkler Preserve, and the city is very much opposed to ANY alternatives that would impact the preserve. As I learned at the meeting, even Fairfax County is now rescinding their support of Alt D, likely as a result of the tongue-lashing they received for attempting to convince the city to support that alternative.

So the county is looking (re-looking?) at alternatives for the HOV ramp that don't impact the Preserve, including bringing it into the south access road, directly into the South Parking Garage, or near the South Parking Garage with a bus ramp that loops around to the proposed Transit Center. They're doing this in part because they're very concerned about Mark Center traffic from the south (i.e. from Fairfax County) would otherwise be stuck going through the 395/Seminary Rd interchange, which is already horribly congested.

However, some of the other options are running into roadblocks themselves. The Army apparently isn't thrilled with the idea of the HOV ramp tying into the south access road. City staff are concerned about direct access into the South Parking Garage in no small part because that garage will have only 40% of the overall site parking. According to the county official I spoke with, the Army is at least willing to consider the option with a bus ramp that loops around to the transit center.

This is important because the design for the overall site is for a 40% mode split. Meaning that they're planning the area with the direct intention of having 40% of commuters using a mode other than driving themselves. An impressive attempt, especially when one considers the location isn't on a Metro line.

I spoke with a few people about the idea that promulgated from the March 1 BRAC Advisory Group meeting, with the HOV ramp flying over the interchange to connect directly with Seminary Road North (as I described in an earlier blog post. City staff are very interested in this design. The Fairfax County rep I spoke with expressed some interest. Unfortunately, response from the VDOT consultants was lukewarm at best.


The meeting was more than just discussion...there were a couple impressions that made themselves very evident. First and foremost, both the city and the majority of meeting attenders do not want the Winkler Preserve impacted in any way or fashion. They also want more than just immediate site access to Mark Center...they want a plan that addresses transportation in the general 395/Seminary Rd vicinity.

The final impression I got from the meeting is that VDOT (or at least their consultants) will not look at other alternative proposals unless city officils officially request them, or the proposal "has merit". While there's hope that they'll actually look at some of the other ideas out there or the city will call them out (the latter is a fair possibility), this impression did not leave me with a warm-and-fuzzy. The general impression I got is that VDOT considers this an Alternative D or bust situation.

Time will tell...

March 11, 2010

Oops...

Stupid me forgot about VDOT's public meeting tonight on the I-395/Seminary Rd interchange, and I don't feel like getting (re)dressed to go trapse out to the meeting at this point. Hope somebody from Alexandria made it and could comment on what went on.

So instead, I provided the following online comment to VDOT on the interchange study:

Suggest VDOT look at new options that would provide the benefit of Alternates D and/or E, but that do not impact the Winkler Preserve. One of the options presented at the March 1 BRAC Advisory Group Meeting would be a good alternative to consider: reconfiguring Seminary Rd through the interchange, and providing a direct flyover ramp between the HOV lanes to/from the south and Seminary Rd to/from the west...offering benefits comparable to Alt D but without the impact on the Preserve.

September 14, 2009

An interchange redo for Southeast DC

Did this one over the weekend...something I've been thinking about for awhile, but forgot to post it to the blog.

It's my idea for a remake of the I-295/South Capitol St/Malcolm X Ave interchange area in front of Bolling AFB, with the net result being more streamlined access, better signal spacing on Malcolm X, and a smaller footprint.

It'd also tie in well with the #6 I mentioned on my bicycle wish list...

Here's a quick image: