Table 2: Spatial distribution of volumes and speeds on MD 100 between MD 295S and Coca Cola Drive Free-Flow Congestion speed Speed Location Volume Volume Time Time (vplph) (vplph) Mean Standard Mean Standard (mph) Deviation (mph) Deviation Section 1972 57.1 5.9 17:02~17:07 998 25.0 11.4 17:07~17:12 A Section 1644 61.3 5.7 16:16~16:21 1240 18.3 5.3 17:15~17:22 B Section 1638 58.6 5.3 17:50~17:55 1147 15.7 7.3 17:15~17:22 C Section 66 58.3 4.3 17:50~17:55 N/A N/A N/A N/A D (ramp) Section 540 43.7 3.7 17:02~17:07 412 25.9 6.2 17:07~17:12 E (ramp) CHAPTER 3: VSL CONTROL ALGORITHMS Introduction This chapter presents the control algorithms embedded in the VSL system for smoothing the transition between the upstream free-flow and downstream congested traffic speeds. The proposed VSL system comprises sensors, variable speed limit signs, variable message signs, and central processing units to execute the real-time control actions. Depending on the approaching volume, driver compliance rate, and congestion level, the central processing unit that integrates
Table 2: Spatial distribution of volumes and speeds on MD 100 between MD 295S and Coca Cola Drive Location Free-Flow Congestion speed Volume (vplph) Time Volume (vplph) Speed Time Mean (mph) Standard Deviation Mean (mph) Standard Deviation Section A 1972 57.1 5.9 17:02~17:07 998 25.0 11.4 17:07~17:12 Section B 1644 61.3 5.7 16:16~16:21 1240 18.3 5.3 17:15~17:22 Section C 1638 58.6 5.3 17:50~17:55 1147 15.7 7.3 17:15~17:22 Section D 66 (ramp) 58.3 4.3 17:50~17:55 N/A N/A N/A N/A Section E 540 (ramp) 43.7 3.7 17:02~17:07 412 25.9 6.2 17:07~17:12 CHAPTER 3: VSL CONTROL ALGORITHMS Introduction This chapter presents the control algorithms embedded in the VSL system for smoothing the transition between the upstream free-flow and downstream congested traffic speeds. The proposed VSL system comprises sensors, variable speed limit signs, variable message signs, and central processing units to execute the real-time control actions. Depending on the approaching volume, driver compliance rate, and congestion level, the central processing unit that integrates