Selecting Ramp Design Speeds, Volume 2: Conduct of Research Report (2021) / Chapter Skim
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Pages 60-67
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60 Section 3. Observational Field Study This section describes an observational field study of vehicle speeds on interchange ramps.
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61 Figure 8. Loop Ramp – Westbound Exit at I-10 and Harper Rd (Image Credit: Google EarthTM Mapping Service)
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62 Figure 10. Diagonal Ramp – Eastbound Entrance at I-10 and Martinez St (Image credit: Google Earth™ Mapping Service)
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63 Figure 12. Outer Connection Ramp – Ramp from Westbound Missouri Route 152 to Northbound I-29 (Image credit: Google Earth™ Mapping Service)
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64 Figure 13. Outer Connection Ramp – Ramp from Southbound I-29 to Westbound Missouri Route 152 (Image credit: Google Earth™ Mapping Service)
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65 Figure 14. Direct Connection Ramp – Ramp from Northbound Missouri Route 9 and Southbound US-69 to Northbound I-635 (Image credit: Google Earth™ Mapping Service)
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66 3.3 Data Collection Site characteristic data for the ramps were collected through a combination of reviewing plans, profile sheets, and aerial images, while other data were collected in the field or estimated based on available information. The following site characteristics were collected for the ramp proper and freeway mainline ramp terminals: • Ramp configuration.
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67 Table 16. Summary of data collected Freeway Freeway/Crossroad Ramp Configuration Entrance or Exit Ramp Freeway Posted Speed Limit (mph)
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