presentation underpass research forest at grogans...
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Research Forest Dr at Grogans Mill RdIntersection Improvement Alternatives
Level of Service (LOS)
• Level of Service Criteria
Acceptable
Optimal
Not Acceptable
Level of
Service
Delay
(sec)Description
A <10sec Free-flow traffic
B 10-20sec Reasonable free-flow
C 20-35sec Stable flow
D 35-55sec Approaching unstable flow
E 55-85 sec Unstable flow
F >85 sec Highly congested traffic conditions
Existing Conditions
Existing (2018): The existing lane geometry with
• Level of Service AM/PM Peak
Level of
service
D/B
Level of
service
B/D
Level of
service
C/B
Level of
service
D/F
Level of
service
C/D
Level of
service
C/D
Background
• Evaluation of existing roadway characteristics, including lane configuration and intersection geometry.
• Evaluation of existing and projected daily traffic, and peak-hour turning movement volumes.
• Evaluation included HGAC projections projected volumes highlight the need for improvement
Research Forest at Grogans Mill
Intersection Average Daily Traffic (ADT)
HGAC Projected Volumes
Year 2018 Year 2022 Year 2040
62,450 78,300 117,500
Lake Woodlands at Grogans Mill
Intersection Average Daily Traffic (ADT)
HGAC Projected Volumes
Year 2018 Year 2022 Year 2040
52,000 102,200 125,500
Alternatives
• Evaluation of the improvements through the intersections for seven alternatives:
– 1. No Build
– 2. At-grade widening
– 3. Underpass
– 4. Single intersection
– 5. Roundabouts (2 lane, 3 lane)
– 6. Grogans Mill Grade-separation and Direct connectors
– 7. Direct connectors
– 8. Single Point Urban Intersection (SPUI)
• Design Year 2022
No-Build
No-Build (2022): The existing lane geometry
• The Level of Service condition justifies the underpass at both locations
Level of
service
D/D
Level of
service
C/E
Level of
service
C/C
Level of
service
E/F
Level of
service
F/F
Level of
service
E/F
Alternatives
At-Grade Widening:
• Research Forest Dr and Grogans Mill Rd
• Lake Woodlands at Grogans Mill Rd
• Level of Service AM/PM Peak
• Design year 2022
Level of
service
D/B
Level of
service
B/D
Level of
service
D/F
Level of
service
C/C
Level of
service
C/E
Level of
service
C/E
* $2 Million Throw Away Cost for
future Underpass at both locations
Alternatives
Underpass: existing lanes at-grade, plus the underpass with 6 lanes
• Level of Service AM/PM peak
• Design year 2022
• Four intersection reconfigured to two intersections
Level of
service
B/B
Level of
service
B/B
Level of
service
A/A
Scenario
Intersection Approach
Level of Service PM Peak Cost
(Approx.)
NW NE SW SE
Existing
(2018)
Research Forest at Grogans Mill B D B F-
Lake Woodlands at Grogans Mill D D
No-Build
(2022)
Research Forest at Grogans Mill D E C F-
Lake Woodlands at Grogans Mill F F
At-grade
widening
(2022)
Research Forest at Grogans Mill B D C F $4 million
Lake Woodlands at Grogans Mill E E $4 million
Underpass (2022)
Recommended
Intersection B B$24 million
Underpass Lanes A A
Single Intersection (2022) F $5 million
2-Lane Roundabout (2022) F F F F $4 million
3-Lane Roundabout (2022) F C F F $4 million
Overpass with Direct Connectors (2022) A D C D $40 million
Direct Connectors (2022) B E C C $30 million
SPUI (2022) B A $50 million
Level-of-Service and Cost Comparison
Recommended Underpass Alternative
Underpass Benefit/Cost Analysis
Delay
Benefit Safety Benefit
Emissions
Benefit
Construction
CostBenefit/Cost
6.0 28.2 0.07 24.06 1.42
Multimodal Level of Service
No-Build LOS Build LOS
Bicycle E/F* E/E*
Pedestrian E C
Bus C/F* C/C*
* Operational LOS
Underpass Cost Estimate ($ Million)
Cost Items Total Federal Local Match
Construction Cost $17.56 $14.04 $3.52
Utility Relocation Cost $0.87 - $0.87
TxDOT Fee $2.40 $ 1.83 $0.57
Design Fee $1.84 - $1.84
Inflation Cost (3 years) $1.39 $0.97 $0.42
Total Cost $24.06 $16.84 $7.22
Regional Connectivity
• IH 45 at Research Forest/TaminaRoad
• Tamina Road Widening
• David Memorial Extension
Regional Connectivity
Support Letters and Resolutions
1. WRUD- HGAC Resolution
2. Montgomery County Precinct 3 Letter
3. City of Shenandoah Resolution
4. Woodlands Area Chamber of Commerce Resolution