DYNAMIC LANE MERGING FOR SHORT TERM WORK ZONES

DYNAMIC LANE MERGING FOR SHORT TERM WORK ZONES By Rami C. Harb Ph. D PE PTOE Essam Radwan Ph. D PE

Simplified Dynamic Lane Merging • MOT plan used in FL is the Motorist Awareness System (MAS) • Add dynamic lane merging schemes to the regular MAS • 2 forms of dynamic lane merging: 1 -Dynamic Early merge 2 -Dynamic Late merge • Compare Safety and Operations

Simplified Dynamic Lane Merging CONVENTIONAL FL MOT

Simplified Dynamic Lane Merging MODIFIED CONVENTIONAL FL MOT

DLM System Design DLM Components 1. RTMS : Remote Traffic RTMS Unit Microwave Sensors 2. On-board processor 3. UHF communication modem 4. Central communications system 5. PCMS: Portable Changeable Message Sign

DLM System Design DLM Components

DLM System Design DLM SETUP

Results Modified MOT Plan Replication in VISSIM

Calibration

MOEs • Speed Variance • Deceleration rates • Coefficient of variance Control Variables • MOT type • Demand Volumes • Vehicle Classification • Compliance rate MOT Types: • MAS • VSL • Early DLM • Late DLM • EDLM+VSL • LDLM+VSL

Results • Early and late SDLMS performed better in both open and closed lane than all other MOT types for low and medium volume levels (V 0500, V 1000 and V 1500). • V 2000 and V 2500, VSL was significantly better than SDLMS combinations, respectively.