This shopping area along the Loop 1 (Mopac Expressway) near US 183 in Travis County created congestion issues on the northbound frontage road due to patron traffic at the center’s access points.  As a joint effort between TxDOT, the City of Austin and the developer, frontage road improvements including widening and re-striping to create acceleration and right turn only lanes for the shop’s access driveways were designed.  Tasks include geometric layouts, roadway design, drainage design and striping plans compatible with the existing frontage road and meeting all TxDOT design requirements.

The LBJ Express project incorporates dramatic improvements to Interstate 635 and Interstate 35E in Dallas County. This innovative project features rebuilt main lanes, a continuous frontage road system, and 13 miles of new express managed toll lanes.  SLG managed traffic data collection and traffic modeling efforts to build and validate an existing conditions Synchro model to be used for additional services.  These additional services include (1) claim assessments to collect new and analyze new traffic data as necessary to determine whether damages were incurred as a result of construction activity, (2) intersection traffic analysis to assess the effects of temporary closures of transverse intersecting roadways along the project, and (3) traffic management plan analysis in order to study and propose alternatives for potential cost or time savings for different traffic management strategies.

This intersection ranked as the most accident-prone intersection in San Antonio and Bexar County for a number of years because of the stop and go traffic and the sheer volume of cars trying to access US 281 and/or Loop 1604. The solution; four non-toll direct connectors linking US 281 and Loop 1604.  SLG took on PS&E development for two pedestrian bridges over US 281 at the interchange with LP 1604.  Initial tasks included design reviews including utility conflict determinations and an overall compatibility review of proposed improvements within an existing interchange reconstruction project.  Plan sheets were developed for the proposed bridges, drainage improvements, traffic control and all other associated design elements.  Plan preparation also included quantity summaries and incorporation of applicable specifications, notes and standards.

IH 35 is being expanded from four to six lanes from the Williamson County line to just north of Hillsboro.  The project will be financed through Proposition 12 and Proposition 14 funds and the American Recovery and Reinvestment Act.  SLG provided Quality Control services for Segment 3 by reviewing and commenting on the extensive traffic control plans being developed for this project.  SLG also provided drainage design services for temporary structures needed to maintain project drainage through various phases of construction.

During relatively intense rain events, Oakridge Drive in the vicinity of Chisholm Trail Middle School (approximately 1000 feet west of Deep Wood Drive) experienced inundation that hindered traffic or even completely blocked the road. Additionally, storm water at times overwhelmed the culvert capacity under Creekview Drive near the Round Rock West Greenbelt (approximately 300 feet west of Deep Wood Drive) causing inundation of the road and flooding of adjacent property. The purpose of this project was to reduce the street inundation/property flooding frequency at these two locations. SLG determined the most feasible, cost effective solution for these flooding issues by analyzing and modeling the existing drainage conditions and looking at possible alternatives. Ultimately, the solution was presented to the City for concurrence and PS&E documents were developed for construction.

Provided design services and coordination efforts with development engineers and TxDOT to secure approval for a commercial access driveway with a dedicated turn lane and a High-T intersection design for a new city street that will serve as access to a proposed development.  With the High-T design, a right turn deceleration lane, a left turn deceleration lane and a left turn acceleration lane were all designed to TxDOT standards.  Before completion of PS&E, this intersection was redesigned as a conventional four-leg with turn lanes and signals.  Project included ROW dedication determinations, environmental documentation (a categorical exclusion), development of a Donation Agreement, utility identification and coordination for relocation efforts, roadway design, storm sewer design, signal design, traffic control plans and completed permit request with required information.  Being a TxDOT let project, General Notes and Specifications and a construction estimate using TxDOT bid items were created and submitted. The commercial access driveway was constructed but the new intersection construction was placed on hold..

Provided design services and coordination efforts with development engineers and TxDOT to secure approval for four, right-in/right-out access points to a proposed development. Project included ROW dedication determinations, environmental documentation (categorical exclusions), TCEQ coordination, Donation Agreements, utility identification and coordination for relocation efforts, roadway design, storm sewer design, signal design, traffic control plans and completed permit request with required information.  Right turn access lanes were designed at three locations to accommodate driveway turning movements. General Notes and Specifications and a construction estimate using TxDOT bid items were created and submitted.

This contract included PS&E services for the full reconstruction and extension of an urban section of SH 6 in the City of Gorman.  The urban project runs from 0.18 mile north of Crescent St. to the Comanche County Line (a length of 1.3 miles).  The existing two-lane with shoulders section is being replaced with an ultimate five-lane section that will initially be striped as a three-lane section with wide shoulders.  Supplemental services are being provided that includes design of a detention pond and a 0.9 mile long “drainage diversion” storm sewer system to take runoff out of the city to alleviate low frequency rainfall flooding. Project, responsibilities include preliminary design for public presentations and PS&E design of all roadway reconstruction elements including storm sewer, cross-culverts, retaining walls, illumination, a flashing beacon, intersection improvements, pedestrian accommodations, signing and striping.  The Sequence of Construction will break the project into manageable sections in order to maintain construction progress while reducing the impacts of long-term construction phases to local businesses.  Extensive coordination with adjacent property owners has been undertaken due to ROW constraints and associated issues with driveway tie-ins.

Project design involved the construction of 4-lane tolled expressway within the median section of the existing US 183/183A corridor from just north of Hero Way to just north of CR 258/CR 213 (approximately 6 miles).  This route will be signed as 183A and includes grade separations and improvements to SH 29 and other cross streets. The proposed improvements are designed with allowance for the ultimate planned improvements to 183A including the addition of a third tolled lane to the inside of the proposed 4-lane section.  Specific responsibilities for this project included design of complex traffic strategies to ensure the safety of the travelling public while providing for good construction progression for expedited delivery.  SLG coordinated efforts of various disciplines (bridge, drainage, ITS, etc.) to ensure constructability while providing a sequencing scheme to allow various projects elements to be constructed in such a manner as to meet a strict construction timeline.  Traffic control considerations included utility relocation efforts, maintaining access to local businesses and subdivisions, accommodating a school bus route and ensuring mobility and safety for the intermingling of passenger and large truck traffic.

Provided design services and coordination efforts with development engineers and TxDOT to secure approval for the redesign of two intersections (US 290/FM 973 and FM 973 at Old HWY 20), the addition of a signal at Ring Road and a commercial driveway access. Widening and turn lane design plans were prepared for the north and south approaches to US 290 along FM 973 and for the southbound approach of FM 973 at Old HWY 20. Project included ROW dedication determinations, environmental documentation, a Donation Agreement, utility identification and coordination for relocation efforts, roadway design, signal design, traffic control plans and completed permit request with required information. General Notes and Specifications and a construction estimate using TxDOT bid items were created and submitted for review. Services extended into construction where periodic inspection services are being performed and reported to TxDOT.

Performed the engineering analysis and design of the proposed ITS and illumination systems for both an interim and an ultimate build condition from 2.68 miles north of Uniroyal Dr. to 1.2 miles north of US 83. The interim build schematic included the design of an ITS fiber optic conduit backbone system and proposed ITS devices consisting of CCTV, RSVD and a permanent loop detection traffic counting station. The interim illumination analysis and design include safety lighting using 50 ft conventional lighting poles at the entrance and exit ramps. The Ultimate build schematic involved adding Direct connectors from IH 35 to and from US 83. The ITS design for the ultimate build expanded to include additional CCTV and RSVD devices to monitor the traffic on the proposed DC ramps. The Ultimate illumination design consisted of analyzing the proposed interchange for illumination consisting of high mast illumination using 150 ft tall poles. Project is on hold. Future tasks will involve PS&E development of relevant design tasks for the project.

Provided engineering services for the preparation of PS&E and related documents for the reconstruction of grade separations and frontage roads on IH35E between Corporate Drive and SH 121 Business in Denton County. The project involves changing the IH35 underpass at Corporate Dr. to an overpass and reconstructing the overpass at SH 121 Business. This included relocation of freeway ramps and total reconstruction of interstate mainlanes and frontage roads. Specific tasks for this project included signing and pavement markings (including development of large sign details) and development of phased, stormwater pollution prevention plans to accommodate construction.

Provided engineering services for the preparation of PS&E and related documents for the reconstruction of grade separations and frontage roads on SH 114 from west of IH 35W to west of US 377 in Denton County. Specific tasks for this project included signing and pavement markings and development of phased, stormwater pollution prevention plans to accommodate construction.

Provided engineering services for the preparation of PS&E and related documents for five safety improvement locations in the Tyler District consisting of sidewalks, crosswalks, pedestrian ramps and pedestrian signals meeting ADAAG requirements and AASHTO and PROWAG guidelines (over a mile of improvements in total). Along with sidewalk and ramp details, tasks for this project included construction easement determinations to accommodate driveway reconstruction, utility coordination, a suggested sequence of construction, stormwater pollution prevention plans, signing and pavement markings.

Schematic development of an existing 2-lane rural roadway to an ultimate 5 lane undivided roadway.  Project limits are from IH 35 northbound frontage road to 1.31 miles east of CR 332, approximately 3.66 miles.  This project involved Route Studies, Traffic Evaluations and Projections, ROW Mapping, Surveying, Preliminary and Final Schematic and Cost Estimate, Drainage Study, Environmental, Geotechnical.

Schematic development of an existing 2-lane rural roadway to an ultimate 4 lane undivided roadway.  Project limits are from CR 313 to FM 486, approximately 1.1-mile-long project.  The project involved Route Studies, Traffic Evaluations and Projections, ROW Mapping, Surveying, Preliminary and Final Schematic and Cost Estimate, Drainage Study, Environmental, Geotechnical.

This contract includes PS&E services for the widening and reconstruction of SH 16 between FM 1480 and the Mills County Line (10.4 miles).  Design is to accommodate the creation of passing lane areas (Super2 Design). The project includes PS&E design of all roadway reconstruction elements including traffic control, cross-culverts, bridge class structure rail upgrades, driveway and intersection improvements, stormwater pollution prevention plans, signing and pavement markings. Additional project tasks include environmental study review, ROW evaluations, subsurface utility engineering, utility adjustment coordination, geotechnical borings and investigations, constructability reviews, project cost estimates, contract time determinations and preparation of project specific specifications and general notes. After project letting, construction phase services will begin.

Preparation of PS&E and related documents for the placement of LED Chevrons and advance warning signs at identified curve locations in the Tyler District. Along with sign layout sheets, this project included identifying limits of ROW preparation, utility coordination, and a simplified stormwater pollution prevention plan.

PS&E development for the widening of an existing 2-lane urban and rural roadway to a 6-lane divided (raised median) facility in Hidalgo County.  Project limits are from Wallace Road to McColl Road, approximately 4.4-miles.  The project includes PS&E design of all roadway reconstruction elements including traffic control, storm sewer, potential sound walls, signals, intersection improvements, pedestrian accommodations, stormwater pollution prevention plans, signing and pavement markings. Additional project tasks will include environmental study reviews, ROW evaluations, utility adjustment coordination, geotechnical borings and investigations, constructability reviews, project cost estimates, contract time determinations and preparation of project specific specifications and general notes. After project letting, construction phase services will begin

US 181 to SH 123 (approx. 5.16 miles). 6” overlay with notch and mill at bridges. Culvert extensions, ditch rework, driveway and side street reconstruction, mailboxes, sign and pavement markings.

Schematic development of an existing 2-lane rural roadway to an ultimate 6 lane median divided roadway.  PS&E development for reconstruction and extension of an adjacent 2-lane roadway. Project limits are from CR 254 to Ronald Reagan Blvd, approximately 2.9-mile-long project.  The project involved Route Studies, ROW Mapping, Surveying, Preliminary and Final Schematic and Cost Estimate, Drainage Study, Environmental, Geotechnical

Provided engineering services for the preparation of PS&E and related documents for the construction of safety improvements consisting of shoulder widening, milling and inlay, hydrologic and hydraulic analysis, box culverts extensions, pavement marking and signing, traffic control plan and SW3P. The PS&E includes 7.9 miles of FM 547 from US 380 to FM 6; 3.4 miles of FM 1777 from FM 6 to CR 677 and 2.6 miles of FM 1777 from CR 677 to SH 66 in Collin County.

Provided engineering services for the preparation of PS&E and related documents for the construction of safety improvements consisting of widening of the existing pavement to provide for continuous two-way left turn lanes. The PS&E includes 1.6 miles of SH 198 from north of US 175 to FM 3080 and 1.2 miles of SH 243 from SH 34 to FM 2727 in Kaufman County.

Providing engineering services for the preparation of PS&E and related documents for the construction a new location freeway from Airport Drive to US 380 in Collin County. Specific tasks for this project included cross culvert plan and profile design, signing (small and large including large sign structure design) and pavement markings, and development of phased, stormwater pollution prevention plans to accommodate construction.

Provided engineering services for the preparation of PS&E and related documents for the reconstruction of an interchange at US83/84 and constructing a widened section and a Super-2 section for US 83. Specific tasks for this project included pedestrian and bicycle facility design and signing and pavement markings.