Determining Guidelines for Ramp and Interchange Spacing (2011) / Chapter Skim
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From page 177... ...
Appendix B Findings From Other NCHRP Datasets
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From page 178... ...
NCHRP Project 3-37 -- Merge Data Collection Sites The following plots contain data in averaged in 15 minute bins collected at merge sites as part of NCHRP Project 3-37. The data is presented in three different ways: • Each 15-minute period classified as stable or unstable flow • Each 15-minute period classified as being on a 2-, 3-, or 4-lane (oneway)
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From page 179... ...
Stable or Unstable Flow Sorted By: LOS A and B 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Stable Flow LOS C 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Stable Flow
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LOS D 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Stable Flow Unstable Flow LOS E 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Stable Flow Unstable Flow LOS F 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Stable Flow Unstable Flow
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From page 181... ...
Number of Freeway Lanes Sorted By: LOS A and B 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway LOS C 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway 4 Lane Freeway
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From page 182... ...
LOS D 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway 4 Lane Freeway LOS E 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway 4 Lane Freeway LOS F 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway
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From page 183... ...
Ramp Volume Sorted By: LOS A and B 0 10 20 30 40 50 60 70 0 5000 10000 15000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Low Vol Ramp (112-500)
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LOS D 0 10 20 30 40 50 60 70 0 5000 10000 15000 20000 Distance to downstream EX Sp ee d B et w ee n R am ps Low Vol Ramp (112-500)
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From page 185... ...
NCHRP Project 3-37 -- Diverge Data Collection Sites The following plots contain data in averaged in 15 minute bins collected at diverge sites as part of NCHRP Project 3-37. The data is presented in three different ways: • Each 15-minute period classified as stable or unstable flow • Each 15-minute period classified as being on a 2-, 3-, or 4-lane (oneway)
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From page 186... ...
Stable or Unstable Flow Sorted by: LOS B and C 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps Stable Flow LOS D 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps Stable Flow Unstable Flow LOS E 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps Stable Flow
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From page 187... ...
Number of Freeway Lanes Sorted by: LOS B and C 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway 4 Lane Freeway LOS D 0 10 20 30 40 50 60 70 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway 4 Lane Freeway LOS E 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps 2 Lane Freeway 3 Lane Freeway
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From page 188... ...
Ramp Volume Sorted by: LOS B and C 0 10 20 30 40 50 60 70 0 5000 10000 15000 20000 Distance to upstream EN Sp ee d B et w ee n R am ps Low Vol Ramp (112-500)
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NCHRP Project 3-75 -- Speed of all vehicles in weaving section (between ramps) The following plots contain data in averaged in 15 minute bins collected at as part of NCHRP Project 3-75.
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From page 190... ...
Sorted by # of Upstream Lanes 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length) Sp ee d B et w ee n R am ps 2 Lanes 3 Lanes 4 lanes 5 Lanes 6 Lanes Sorted by On-Ramp Volume 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length)
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Sorted by Total Ramp Volume (on and off) 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length)
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Site Notes 2 - 2 lane exit Sky03 - cloverleaf Sky06 - 2 lane entry Sky09 - 2 lane exit Sky10 - 2 lane entry and 2 lane exit Sorted by Site 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length) Sp ee d B et w ee n R am ps 1 Emeryville, CA (NGSIM 1)
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NCHRP Project 3-75 -- Reduction in free-flow speed of all vehicles in weaving section (between ramps)
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Sorted by # of Upstream Lanes 0.0 10.0 20.0 30.0 40.0 50.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length) Sp ee d R ed uc tio n B et w ee n R am ps 2 Lanes 3 Lanes 4 lanes 5 Lanes 6 Lanes Sorted by On-Ramp Volume 0.0 10.0 20.0 30.0 40.0 50.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length)
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Sorted by Total Ramp Volume (on and off) 0.0 10.0 20.0 30.0 40.0 50.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length)
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From page 196... ...
Site Notes 2 - 2 lane exit Sky03 - cloverleaf Sky06 - 2 lane entry Sky09 - 2 lane exit Sky10 - 2 lane entry and 2 lane exit Sorted by Site 0.0 10.0 20.0 30.0 40.0 50.0 0 500 1000 1500 2000 2500 3000 Ramp Spacing (Base Length) Sp ee d B et w ee n R am ps 1 Emeryville, CA (NGSIM 1)
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