21. Texas Department of Transportation

1998 ◽  
pp. 303-306
Author(s):  
Craig A. Steffens
Keyword(s):  
Department Of Transportation ◽  
Texas Department

scholarly journals Titus Phase Archeology at the S. Stockade Site (41TT865) on Tankersley Creek, Titus County, Texas

2003 ◽  
Author(s):  
Timothy K. Perttula ◽  
Bo Nelson ◽  
LeeAnna Schniebs
Keyword(s):  
Department Of Transportation ◽  
The West ◽  
Standing Water ◽  
Texas Department ◽  
Small Rise ◽  
Dense Concentration

The S. Stockade site was discovered on a small rise (330 feet amsl) in the Tankersley Creek floodplain during a recent archeological survey for the Texas Department of Transportation. Tankersley Creek is a southward-flowing tributary to Big Cypress Creek, and enters that creek’s floodplain a few miles below the Lake Bob Sandlin dam. There is a dense concentration of prehistoric archeological sites throughout the Tankersley Creek valley, particularly post-A.D. 800 Caddo Indian sites. This paper discusses the archeology of the S. Stockade site, a Late Caddoan Titus phase settlement. The rise at the S. Stockade site is grass-covered (with a surface visibility of less than 10%), except along the eroded slopes, where the clay B-horizon subsoil is exposed. The old creek channel immediately to the west of the rise has recently been channelized, and between the rise and the channelized creek are several low-lying marshy areas with standing water.

Assessment of in Situ Structural Properties of Lime-Stabilized Clay Subgrades

1996 ◽  
Vol 1546 (1) ◽  
pp. 13-23 ◽  
Author(s):  
Dallas N. Little
Keyword(s):  
Structural Properties ◽  
Previous Literature ◽  
Cone Penetrometer ◽  
Department Of Transportation ◽  
Lime Stabilization ◽  
Dynamic Cone Penetrometer ◽  
Texas Department ◽  
Aggregate Base ◽  
Falling Weight

Lime-stabilized clay subgrades are used almost routinely in Texas to facilitate construction and to provide a foundation for aggregate base courses and hot mix surfaces. Research sponsored by the Texas Department of Transportation demonstrates that the in situ moduli and strength improvements afforded by lime stabilization of these layers are often significant and deserve structural consideration. A study of the range of modulus values determined from falling weight deflec-tometer deflection data and supported by in situ dynamic cone penetrometer data for 40 pavement subgrades indicates that the lime-stabilized subgrades provide a level of stiffness and strength that is similar to that of an unbounded aggregate base. This substantiates previous literature suggesting that properly designed and constructed lime-stabilized subgrades should be assigned AASHTO structural coefficients in the same range as unbound aggregate bases, that is, between 0.10 and 0.14.

Developing Operational and Safety Guidelines for School Sites in Texas

2005 ◽  
Vol 1922 (1) ◽  
pp. 90-97
Author(s):  
Scott A. Cooner
Keyword(s):  
Field Studies ◽  
Advisory Panel ◽  
Department Of Transportation ◽  
School Site ◽  
Texas Department ◽  
District Personnel ◽  
Site Access ◽  
School Sites ◽  
Site Planning ◽  
A Site

The objective of a two-year study was to recommend school site planning guidelines for transportation-related elements such as site selection, general site requirements and design, bus operations, parent drop-off and pickup zones, driveways, turn lanes, signing and marking, parking, and pedestrian and bicycle access. The research team based these guidelines on a comprehensive review of existing guidelines and the results of field studies at school sites in Texas. Examples are provided of good practices and of practices to avoid for three of the more prominent guidelines. The guidelines are focused on transportation design, operations, and safety within school sites—with a particular focus on the parent drop-off and pickup zones. A site plan review checklist based on the 21 consensus guidelines approved by the project advisory panel is provided. Texas Department of Transportation engineers, field crews, architects, and school district personnel can use this checklist to coordinate efforts and improve the safety and efficiency of school site access and traffic flow.

Results from Phase I of a Pilot Study on Dynamic Ramp Metering in Houston

2020 ◽  
Vol 2674 (11) ◽  
pp. 478-489
Author(s):  
Hongmin “Tracy” Zhou ◽  
Magdy Kozman
Keyword(s):  
Pilot Study ◽  
Phase I ◽  
Ramp Metering ◽  
Cost Ratio ◽  
Department Of Transportation ◽  
Benefit Cost Ratio ◽  
The Past ◽  
Texas Department ◽  
The Right ◽  
Benefit Cost

Traffic in Houston, U.S., has continued growing over the past decade. The Houston District of the Texas Department of Transportation (TxDOT) recently began a pilot study to evaluate a dynamic ramp metering system. The project is aimed to convert ramp metering from local control to system-wide dynamic operation. In Phase I of the project, major control parameters and different metering strategies were tested and evaluated in simulation and field settings for a study corridor installed with six ramp meters. The study identified a base metering plan that overall worked well for sites without restrictive queue conditions. This base plan was that average speed of 50 mph or lower in the right-most two mainlanes will call for metering at a constant metering rate of 850 vehicles per hour for at least 4 min, and that queue occupancy of 50% or higher will call for meter shutdown for at least 1 min. Ramp metering coordinated with the downstream intersection performed well by accommodating diverted traffic caused by ramp metering. When operating ramp meters in a group, metering the immediately upstream meter performed best compared with metering further upstream meters. It is evident that ramp metering caused traffic diversion to the frontage road and also caused reduced queue-jumping behaviors on the frontage road at ramp meters with an immediately upstream exit ramp. The coordinated ramp metering strategy can potentially generate a benefit/cost ratio of 117:1 compared with local metering in the District.

scholarly journals Evaluation of Variable Speed Limit Pilot Projects for Texas Department of Transportation

2016 ◽  
Vol 15 ◽  
pp. 676-693
Author(s):  
Beverly Kuhn ◽  
Kevin Balke ◽  
Robert Brydia ◽  
Luann Theiss ◽  
Ioannis Tsapakis ◽  
...  
Keyword(s):  
Speed Limit ◽  
Department Of Transportation ◽  
Variable Speed ◽  
Pilot Projects ◽  
Variable Speed Limit ◽  
Texas Department

scholarly journals Frankston Phase Ceramics from the Alcoa #1 (41AN87) Site, Mound Prairie Creek, Anderson County, Texas

2009 ◽  
Author(s):  
Timothy K. Perttula
Keyword(s):  
Department Of Transportation ◽  
Ceramic Assemblage ◽  
University Of Texas ◽  
15Th Century ◽  
Texas Department ◽  
Ceramic Vessel ◽  
Ceramic Vessels ◽  
Ceramic Sherd ◽  
The University ◽  
Neches River

In 1990, Amick investigated a well-preserved Late Caddo Frankston phase midden deposit at the ALCOA #1 (41AN87) site on Mound Prairie Creek, about 7 km northeast of Palestine, Texas. During the course of that work, more than 900 Caddo ceramic vessel sherds and a few pipe sherds were recovered, but they were only cursorily described by Amick. That was unfortunate at the time because it appeared then, and is still evident now, that the ALCOA #I site was a single component 15th century A.D. Frankston phase settlement, and detailed study of the recovered ceramic assemblage would have provided unique insights into the stylistic and technological character of the ceramic vessels being made and used for culinary purposes by the prehistoric Caddo in this part of the Neches River basin. With the renewed study of the archaeology of the Frankston phase occasioned by the Texas Department of Transportation-sponsored excavations at the Lang Pasture site (41AN38) and the recovery there of a substantial ceramic sherd assemblage-and the reexamination of sherd and vessel collections from Frankston phase collections at the Texas Archeological Research Laboratory, The University of Texas at Austin, I returned to the detailed study of the ALCOA # 1 ceramic assemblage. The assemblage of ceramic vessel sherds from the Amick work is sufficiently robust that it is possible to characterize with some precision the use of fine wares, utility wares, and plain wares by the 15th century A.D. Caddo that lived at the site.

scholarly journals A Partial Magnetometer Survey of The Archaeological Conservancy’s Portion of the A. C. Saunders Site (41AN19)

2018 ◽  
Author(s):  
Dale Hudler ◽  
Jonathan Jarvis ◽  
Tim Griffith
Keyword(s):  
Research Design ◽  
Research Laboratory ◽  
Principal Investigator ◽  
Department Of Transportation ◽  
University Of Texas ◽  
Right Of Way ◽  
Texas Department ◽  
The Right ◽  
The University

The Texas Archeological Research Laboratory (TARL) at The University of Texas at Austin conducted a partial magnetometer survey of The Archaeological Conservancy-owned portion of the A. C. Saunders site (41AN19) during the period between 6-8 December 2005. This survey was sponsored by the Texas Department of Transportation Environmental Affairs Division (TxDOT/ENV) due to a proposed expansion of the right-of-way of U.S. Highway 175 and was conducted under a research design approved by The Archeological Conservancy and TxDOT/ENV. The work was conducted under the direction of Dale Hudler (Principal Investigator) from TARL with a joint TARL/Prewitt and Associates, Inc. field crew (Jonathan Jarvis, TARL and Tim Griffith, Prewitt and Associates, Inc.).

Accommodation of Saltwater Temporary Pipelines on the Roadside

2018 ◽  
Vol 2672 (12) ◽  
pp. 198-208
Author(s):  
William Holik ◽  
Cesar Quiroga ◽  
Ioannis Tsapakis ◽  
Jing Li
Keyword(s):  
Oil And Gas ◽  
Percentage Reduction ◽  
Department Of Transportation ◽  
Clear Zone ◽  
Gas Wells ◽  
Right Of Way ◽  
Texas Department ◽  
Oil And Gas Wells ◽  
Maintenance Activities ◽  
The Right

Drilling and completing oil and gas wells, particularly when using horizontal and hydraulic fracturing techniques, requires enormous amounts of water. Generally, it is cheaper for the industry to move fluids by pipeline than by truck, hence the interest in using permanent and/or temporary pipelines to transport water in areas where oil and gas developments take place. This paper describes temporary pipeline installation and operation practices and how they impact roadside maintenance activities as well as offering guidelines on how to install and operate temporary pipelines. A GIS database of temporary pipeline locations was developed from permits issued by the Texas Department of Transportation between July 2011 and August 2016. General trends indicate that temporary pipelines are typically 3, 4, 8, or 10 inches in diameter. Operators tend to favor certain highway segments to install temporary pipelines within the right of way. When multiple temporary pipelines are installed on segments repeatedly, this can affect maintenance operations. Several trends were observed that necessitate the development of guidelines for temporary pipelines. Many temporary pipelines were placed away from the right of way line, which creates conflicts with maintenance operations and results in some temporary pipelines being in the clear zone. Many temporary pipelines are not anchored in place and roll into the bottom of ditches or do not maintain a uniform alignment, which affects roadside maintenance. The percentage reduction in overtopping flow rate due to installing temporary pipelines through culverts is also analyzed.

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