Office of Operations
21st Century Operations Using 21st Century Technologies

Decision Support Framework and Parameters for Dynamic Part-Time Shoulder Use:
Considerations for Opening Freeway Shoulders for Travel as a Traffic Management Strategy

List of Acronyms

AADT annual average daily traffic
ATDM active traffic demand management
ATM active traffic management
CMF crash modification factors
CMP congestion management process (Federal guidelines) or Congestion Management Program (locally or regionally adopted)
CMM Capability Maturity Model
ConOps concept of operations
d/c demand-to-capacity (ratio)
DOT department of transportation
DSF decision support framework
D-PTSU dynamic part-time shoulder use
ER emergency responders
FFS free flow speed
FSP freeway service patrol
FHP Florida Highway Patrol
FHWA Federal Highway Administration
FI fatal and injury
GPS Global Positioning System
GIS geographic information systems
HCM Highway Capacity Manual
HOT high occupancy toll
HOV high occupancy vehicle
ITS intelligent transportation systems
LOS level of service
MDOT Michigan Department of Transportation
mi/h miles per hour
MPO metropolitan planning organization
MTP metropolitan transportation plan
MUTCD Manual on Uniform Traffic Control Devices
NHS National Highway System
NPMRDS National Performance Management Research Data Set
PCE passenger car equivalent
pc/h passenger cars per hour
pc/h/ln passenger cars per hour per lane
PDO property damage only
PeMS (California's) Performance Measurement System
PBPD performance-based practical design
PBPP performance-based planning and programming
PLM product limit method
PTI planning time index
PTSU part-time shoulder use
SHRP 2 Second Strategic Highway Research Program
SOV single occupant vehicle
SPF safety performance function
S-PTSU static part-time shoulder use
TIP transportation improvement program
TOPS-BC Tool for Operations Benefit-Cost
TMA transportation management area
TMC transportation management center
TSMO transportation systems management and operations
TTI travel time index
V/C volume to capacity ratio
VHD vehicle hours delay
VHT vehicle hours traveled
VMT vehicle miles traveled
veh/h/ln vehicles per hour per lane
WSDOT Washington State Department of Transportation
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