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David R Schneider
New member
Username: Davids

Post Number: 2
Registered: 04-2003
Posted on Friday, April 11, 2003 - 10:45 am:   

Recently, the flow of traffic on Legacy towards 121 has slowed significantly. In the past week, I have spent from 7-10 minutes per morning to make it through the stop signs at Warren and at Stonebriar (on Legacy). Up until 2 months ago, that section averaged 2 minutes per morning. The bottleneck appears to be the 4 way stop sign at Stonebriar iteself.

Could someone please take a look at options here? I know there are esthetic considerations at Stonebriar, but the current situation is getting out of hand. By all rights, I would not normally expect there to be stop signs for northbound or southbound Legacy at an intersection of this type.

I live in the Stewart Creek Estates off Lebanon, and there are no alternative routes. With Lone Star ramping up, this will only get worse with time. Thanks.
 

Brian Moen, Traffic Engineer
Moderator
Username: Brian

Post Number: 71
Registered: 07-2001
Posted on Monday, April 14, 2003 - 01:19 pm:   

David,

We are currently working on two different projects in this area.

The first project is the construction of the missing lanes on Legacy between Stonebriar and Warren. We are currently finalizing a contract for engineering services to design this portion of Legacy. This contract is expected to go to the first City Council meeting in May. The engineering will take about 6 to 7 months to complete. Once complete, we will bid the project and then begin construction.

The second project is the design and construction of new traffic signals along Legacy. Going before the City Council tomorrow night is a contract to have traffic signals designed for the intersections of Legacy at Stonebriar and Legacy at Warren. The design of these signals should be completed in about 3 to 4 months. These signals will probably be constructed at the same time the new lanes on Legacy are constructed.

We should also begin to see some relief to this area beginning Friday, April 18 depending on the weather. On Friday, NTTA is expecting to open the new westbound frontage roads along SH 121 at Dallas Parkway. The opening of these frontage roads should improve traffic flow in this area. As a result, fewer drivers may divert to Legacy to avoid the SH 121 and DNT area in the morning.

Thanks
Brian Moen
Traffic Engineer
bmoen@ci.frisco.tx.us
 

David R Schneider
New member
Username: Davids

Post Number: 3
Registered: 04-2003
Posted on Tuesday, April 15, 2003 - 09:36 am:   

Thanks for your response, Brian.

There was a policeman directing traffic this morning at Warren & Legacy. Not sure if this helped or not, but it seemed a little better. I hope this continues for a few days to see what kind of difference it makes.

I am also curious about the reference you made to traffic diverting to Legacy to avoid 121. Can't imagine that as much of an issue, but you may very well be right. There is certainly no question that 121 & DNT is clogged in the morning.

A couple of additional questions:

1. Will there be any attempt to synchronize these 2 lights in the morning to keep Legacy traffic moving?
2. It looks to me as if both of the intersections getting a light are already completed. Given that the completion of the Legacy expansion is still a year away, what purpose is served by waiting to install the lights?

Thanks.
 

Brian Moen, Traffic Engineer
Moderator
Username: Brian

Post Number: 72
Registered: 07-2001
Posted on Wednesday, April 16, 2003 - 02:09 pm:   

David,

Thanks for the questions.

Question #1, Yes these two signals will be synchronized when necessary. I would definitely expect them to be synchronized during the weekday AM and PM peak periods. It is likely other times will also be included, but we will need to collect more data before making that determination.

Question #2 - I will be have a better answer once the design of Legacy is complete. I expect both intersections to be affected by the construction. The current crossovers may have be relocated or eliminated in order for the construction to allow for the new lanes to tie into the existing pieces of Legacy. We will be working with the design engineers to see what type of construction sequencing can be developed that will maintain traffic flow, motorist safety, proper signal operations, and allows for the construction to be completed safely and at a reasonable cost.

If these intersections are impacted, it will have a major impact on the signal operations. It could essentially mean coming back in with some type of temporary signal just after completing the permanent, or building a temporary only to follow it up shortly afterwards with a permanent. As it stands now the permanents will probably be about $130,000 to $150,000 each. Temporary signals run about $75,000 to $90,000 each. I am sure there could be some cost savings between the two, but we won’t know the cost implications until more of the detailed design work is completed.

As for traffic diversion – The reason for my statement about traffic diversion was based on a significant increase in traffic along westbound Warren near Legacy since the start of the DNT and SH 121 construction. Hopefully some of these motorists will return to their old routes as traffic conditions improve along Dallas Parkway and on SH 121.

Thanks
Brian Moen
Traffic Engineer
 

Anonymous
Posted on Friday, April 18, 2003 - 01:02 pm:   

On another thread, it says the engineering work for Main St. east and west of custer will take about 8 weeks. Now, if my car odometer is correct, the missing section of legacy from stonebriar to Warren is less than half a mile. Can you explain how it will take 6 or 7 months to engineer this? There are no utility poles, the land is empty, it does not seem to be a complicated project. Is the extensive time because of other priorities? If so, I think the city needs to re-evaluate. This intersection is getting worse by the day.
 

fjaromin
Unregistered guest
Posted on Monday, April 21, 2003 - 09:13 am:   

The work at Custer and Main Street is already 50% complete. The City of McKinney had completed this early last year. The Frisco portion is about 700 feet in length and the engineering was about 40% from a different contract. As far as Legacy the ROW has not been acquired and will be the driving factor for completion of the Roadway.
 

Anonymous
Posted on Monday, April 21, 2003 - 09:18 pm:   

You report that a signal is warranted at Legacy and Stonebriar but not at Legacy and Lebanon. how can that be? What is the difference in traffic counts?
 

Brian Moen, Traffic Engineer
Moderator
Username: Brian

Post Number: 75
Registered: 07-2001
Posted on Tuesday, April 22, 2003 - 12:34 pm:   

To satisfy one of the volume warrants, both roads need to meet certain volume thresholds for a specified period of time. Most often, the time period is over 8 hours. One of the roads must satisfy the "major road" criteria while the other road must satisfy the "minor road" criteria. When the last study was conducted at Lebanon and Legacy in the spring of 2002, neither Lebanon nor Legacy had enough volume to meet the "major road" criteria at this intersection.

At the time the study was conducted, Legacy near Lebanon had about 12,000 less vehicles per day than the portion of Legacy near the Stonebriar entrance.

We are planning on conducting a new study at this location within the next month. We currently try to update our studies annually at locations where we expect to have signals at some point in time.

If you would like to discuss the warranting process, you may call me at 972-335-5580 x196.

Thanks
Brian Moen
Traffic Engineer
bmoen@ci.frisco.tx.us

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