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Old April 5th, 2013, 10:42 PM   #8821
ChrisZwolle
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I-70 Blanchette Bridge, Missouri

The westbound Blanchette Bridge of I-70 west of St. Louis across the Missouri River is being replaced.

They demolished the old span last December and are now constructing the replacement span.
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Old April 7th, 2013, 04:07 AM   #8822
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Over this weekend (and the past weekend), there was a major roadworks closure on I-5 northbound in Seattle to replace expansion joints.

Fortunately, this was in the middle of a managed motorway corridor with lane signalling gantries. The Washington State DOT is one of two agencies that have this system (the other being the Minnesota DOT and theirs isn't quite as nice). I was able to get some pictures of the signage. It's listed upstream to downstream.

Strategic diversion VMS legends are used to divert people from a primary route onto a secondary route. These legends are similar in function to the dWista panels in Germany, although they are just standard VMS equipment.

WSDOT is also one of the few American agencies with VMS standardization policies. The messages are kept consistent across VMSs of different sizes to improve readability. Studies have shown that recognition time is decreased with standardized legends, so the text is kept identical despite a larger sign being available. This follows an approach adopted by many European agencies. VMS legends cycle 2 messages at most, changing every 2 to 2.5 seconds.






Queue protection begins with a speed limit display along with "Slow traffic ahead" on the sides.







Lane closure signalling begins. Note that lane signalling allows the HOV lane to be opened for all traffic due to a significant number of lanes on the carriageway being closed downstream. The lane closure "Red X" signals are tapered across multiple gantries to allow for reaction time and extra merging distance.

Again note that VMS legends are kept as consistent as possible to improve readability and recognition time, despite the signs being different sizes.






More lane signalling











Ramp metering is active to regulate the inflow of traffic and improve merging conditions.



The expansion joint replacement



End of work zone. Note that the HOV lane is still open to all traffic to prevent erratic lane changes. It's a minor detail, but it makes sense for additional safety.



The HOV lane is returned to normal 2+ occupant operations 800 m afterwards. By now, traffic has been given time to regain headway distance and return to the right-hand lanes (although lane discipline is poor in this region).



And onto Seattle

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Old April 7th, 2013, 06:36 AM   #8823
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Nice and comprehensive report

VMS can do wonders to avoid a bad situation become a nightmare.
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Old April 7th, 2013, 06:41 AM   #8824
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Honestly I am kind of surprised more cities do not use VMS systems with variable speed limits and lane control signals that Seattle has. It would certainly help in keeping traffic moving and preventing possible bottlenecks.
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Old April 7th, 2013, 10:04 AM   #8825
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Excellent post there!
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Old April 7th, 2013, 07:15 PM   #8826
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Quote:
Originally Posted by diablo234 View Post
Honestly I am kind of surprised more cities do not use VMS systems with variable speed limits and lane control signals that Seattle has. It would certainly help in keeping traffic moving and preventing possible bottlenecks.
It's coming soon. GDOT will install something similar later this year on the top end of I-285 in Atlanta. I expect TXDoT will follow soon in the Houston and Dallas areas, perhaps enabling 75 mph limits on urban freeways/tollways at night and in very light traffic.
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Old April 8th, 2013, 03:41 AM   #8827
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Quote:
perhaps enabling 75 mph limits on urban freeways/tollways at night and in very light traffic
highly doubt it for Texas, they have a night speed limit posted below that of 75mph.
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Old April 8th, 2013, 08:33 AM   #8828
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Quote:
Originally Posted by diablo234 View Post
Honestly I am kind of surprised more cities do not use VMS systems with variable speed limits and lane control signals that Seattle has. It would certainly help in keeping traffic moving and preventing possible bottlenecks.
It would need good compliance. Compliance in Seattle has gotten better but it has been a little over 2 years. It's quite amazing though when people follow the signs because they can move through a bottleneck situation very quickly.

However it takes just one person cutting in line at the last second to bring smooth-flowing traffic to a stop.
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Old April 8th, 2013, 04:51 PM   #8829
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Quote:
Originally Posted by ChrisZwolle View Post
The westbound Blanchette Bridge of I-70 west of St. Louis across the Missouri River is being replaced.

They demolished the old span last December and are now constructing the replacement span.
Interesting, it looks like they are replacing spans like for like. No new design.
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Old April 8th, 2013, 04:51 PM   #8830
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I-70 New Mississippi Bridge, St. Louis

April update:
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D5647_CM_R2-123 by MoDOT Photos, on Flickr

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D5647_CM-157 by MoDOT Photos, on Flickr
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Old April 10th, 2013, 02:01 AM   #8831
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From AL.com

The Interstate 20 eastbound closure -- between the I-20/59 split and I-459 -- began at midnight and will affect outbound traffic for the next three months.

ALDOT is reconstructing the road surface on this section which hasnt had any work done it since this portion of I-20 opened in 1974. After the eastbound lanes are done, the westbound lanes will be closed for 90 days.

The detour is I-59 North to I-459 South to I-20 East.
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Old April 10th, 2013, 07:03 PM   #8832
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Quote:
Originally Posted by Jschmuck View Post
highly doubt it for Texas, they have a night speed limit posted below that of 75mph.
Texas got rid of night limits in 2011 in addition to increasing most rural speed limits to 75.
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Old April 11th, 2013, 07:23 PM   #8833
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Interstate 70 - Denver

CDOT plans a major overhaul of the Interstate 70 corridor, east from I-25 to Tower Road (Peña Blvd to Denver Airport). This freeway currently has six lanes and is partially elevated in northern Denver.

The preferred alternative will widen I-70 to 10 lanes and depress the freeway in the residential areas of north Denver, putting a cover across a part of the freeway. Although it's a pretty drastic widening, only 55 homes would have to be demolished. Most of I-70 runs through industrial and commercial areas.



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Old April 16th, 2013, 03:26 AM   #8834
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The old dual carriageway on future I86 between Lowman and Elmira, NY, was recently converted into a full expressway. Drove there on Wednesday, although it was heavy thunderstorm. Google Earth and accompanied map still show old dual carriageway with junctions in the same level. However, the Interstate badge signs are covered with black foil, only the tables with FUTURE I86 are shown.
Between Monticello and Binghamton, NY, there are works on conversion of old bridges into the expressway-standard ones. Between Hancock and Deposit, NY, there are still a few old-fashioned junctions in the same level.
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Old April 16th, 2013, 09:40 PM   #8835
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Quote:
Originally Posted by ChrisZwolle View Post
CDOT plans a major overhaul of the Interstate 70 corridor, east from I-25 to Tower Road (Peña Blvd to Denver Airport). This freeway currently has six lanes and is partially elevated in northern Denver.

The preferred alternative will widen I-70 to 10 lanes and depress the freeway in the residential areas of north Denver, putting a cover across a part of the freeway. Although it's a pretty drastic widening, only 55 homes would have to be demolished. Most of I-70 runs through industrial and commercial areas.



So is CDOT planning to add HOV/HOT Lanes to I-70 East? That seems a bit overboard to me.
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Old April 16th, 2013, 09:47 PM   #8836
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I wonder what their plan of financing is. These do look like express lanes (i.e. tolls) but their cross-section diagrams show 5 undivided lanes each way, with no suggestion of HOV or toll lanes.
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Old April 18th, 2013, 07:04 PM   #8837
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I-94 Edens Expressway, Chicago, IL

Apparently flooding is a recurring issue on the Edens Expressway, the oldest expressway in the Chicago area.

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Old April 18th, 2013, 09:24 PM   #8838
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It's nice to see Interstate 22 signs up!
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Old April 18th, 2013, 09:52 PM   #8839
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Dig those crazy LA Freeways



http://asphaltplanet.ca/CA/I/105/index.html
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Old April 21st, 2013, 12:08 AM   #8840
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I-495 Queens

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