Super 2: Recent Research in Energy Corridors
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1 Super 2: Recent Research in Energy Corridors Kay Fitzpatrick Senior Research Engineer Texas A&M Transportation Institute
2 Super 2 Highways Definition Discussed in TxDOT Roadway Design Manual (Chapter 4, Section 6) In Texas, a Super 2 highway is defined as a two-lane rural highway in which periodic passing lanes have been added to allow passing of slower vehicles and the dispersal of traffic platoons
3 Current Practice TS2 (PL-1) 12 [Alternating]
4 Current Practice TS2 (PL-1) 12 [Separated] Optional 4 Dotted Extension Line
5 Super 2 Highways Operations Recommendations, Eliminate use of ADT as upper limit ADT as tool to prioritize competing projects Addition of lanes preferable to added length Marginal benefits for >2 mi at less than ADT >3 mi length should be used sparingly, avoid longer than 4 mi
6 Measures Super 2 Highways Safety Study Results, Segment Value Segment & Intersection After crashes (actual) Crash predicted (EB estimate) Percent reduction 35% 42% Statistically 95% yes yes
7 TxDOT 2016 Study, Small effort focused on energy corridors Identify how heavy truck characteristics could influence roadway design guidance for rural two-lane highways Develop 2-pg briefing sheets on treatments Available at:
8 TxDOT 2016 Study, Traffic: Field Data Collection Data collection in September 2016 Four corridors with energy exploration facilities: Eagle Ford -- US-183 and SH 72 (w/ passing lanes) Permian Basin -- US-285 and SH 302 (no passing lanes) Components: Video of operations Spot speeds Site characteristics
9 Speed (mph) TxDOT 2016 Study, Traffic: Observed Spot Speeds Sites with passing lanes, 72 and 183 Speed difference between cars and trucks is lower Speed variability (standard deviation) is smaller Average speeds are closer to posted speed limit Free-Flow Vehicles PC Truck PSL 72 D 72 U 183 D 183 U 302 D 285 D 285 U Highway, U=Up or D=Down from Recording Location
10 TxDOT 2016 Study, Super 2 Highways, Design Consistency TxDOT RDM provides for passing lane length: Desirable: mi (longer passing lanes are acceptable, but not recommended more than 4 miles. Consider switching the direction if more than 4 miles) Observation: when varying passing lane lengths are used, driver expectancy is violated, therefore, consistent passing lane length is desirable Signing and pavement markings used to inform drivers of next passing lane
11 TxDOT 2016 Study, Super 2, Review Current Practices Approximately 20 Super 2 corridors, primarily in south and northwest Texas More under construction, in PS&E, or on wish lists Corridor lengths = 12 to 69 miles Can span multiple counties Some have been extended since
12 TxDOT 2016 Study, Summary of Review via Google Earth Passing lane lengths vary greatly Generally between 0.85 mi and 1.85 mi Advance signing not always present Pavement markings Dotted line observed at 7 of 20 sites Arrow marking observed at 7 of 20 sites Saw examples of turning/speed change lanes within Super 2
13 TxDOT 2016 Study, : Suggestions Designing Energy Corridor Treatments Super 2 Highways Use! Super 2 Passing Lane Lengths Room for improvements in consistency of length used No evidence supporting a change in desired length at this time (i.e., use mi)
14 TxDOT 2016 Study, : Suggestions Designing Energy Corridor Treatments Super 2 Signing & Markings Room for improvements in consistency of use No evidence supporting changes to TS-2 other than the potential of adding an (optional) example of an end of lane arrow Example from Minnesota: ***place transition arrows adjacent to lane reduction signs **** lane reduction transition arrows are optional for speeds less than 45 mph Source: eng/pavement/typicaldetail/passin gandtransitionlanes.pdf
15 TxDOT 2016 Study, : Questions for Energy Corridor Treatments Much is still unknown about the needs of trucks to pass on two-lane highways, particularly trucks passing other trucks Increasing issue: cars passing multiple trucks (platoons or convoys) How to handle passenger cars passing convoys of trucks?
16 TxDOT 2016 Study, Closing Report (Tech Briefs) available at: P1.pdf TRB paper on Potential Effects of Heavy Vehicles on Operations of Super 2 Highways Questions: Kay Fitzpatrick, K-Fitzpatrick@tamu.edu Marcus Brewer, M-Brewer@tamu.edu Jon Epps, J-Epps@tamu.edu Bill Stockton, B-Stockton@tamu.edu
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