P

PCA
Portland Cement Association

PCC
Portland cement concrete

PCI
Pavement Condition Index
Precast/Prestressed Concrete Institute

PDA
predetermined access

PDARG
Project Development Automation Resources Group

PDQ
Position Description Questionnaire

PDS
Personal Development Seminars

PE
preliminary engineering
professional engineer

PFC
passenger facility charge

PH
public hearing

PIL
partial interchange lighting

PIM
public information meeting

PL
property line
public law

PM
particulate matter
program manager
project manager

PMDs
post-mounted delineators

PMS
pavement management system

PMT
personal miles of travel
Project Management Team (for Iowa DOT)

POTW
publicly owned treatment works

POV
privately owned vehicle

ppb
parts per billion

PPE
personal protective equipment

PPM
parts per million
Policies Procedures Manual

PPP
Pollution Prevention Plan
public participation process
public-private partnerships

PRAC
Passenger Rail Advisory Committee

PRIIA
Passenger Rail Investment and Improvement Act of 2008

PRF
Primary Road Fund

PRISM
Performance and Registration Information Systems Management

PRT
perception-reaction time

PSA
public service announcement

PSI
pounds per square inch

PSR
present serviceability rating

PSS
project scheduling system

PTIG
Public Transportation Infrastructure Grants

PTMS
public transportation management system
Public Transit Equipment and Facilities Management System

PTP
Passenger Transportation Plan

Pub. L. No.
A congressional session law reference consists of three parts: (1) name of the statute (or if not named "Act of [date]"); (2) its public law number ("Pub. L. No."); and (3) original section number (when discussing less than the full act). If the statute has no official or popular name, the form "Act of [full date of enactment]" should be used. The section number follows the public law or chapter number, not the name of the act.

See Iowa Department of Transportation's Style Manual – Online Reference for examples.

PWIM
portable weigh-in-motion

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Q

QA
quality assurance

QBS
qualifications-based selection

QHSO
qualified human service organization

QC
quality control
Quality Council

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R

RAC
Rail Advisory Committee (state industry group)

RAIRS
Railroad Accident /Incident Reporting System

RCB
reinforced-concrete box

RCE
resident construction engineer

RCI
Roadway Congestion Index

RCP
reinforced concrete pipe

RCRA
Resource Conservation & Recovery Act of 1976

REAP
Resource Enhancement and Protection

RED
Rail Economic Development

RFI
request for information

RFP
request for proposal

RFQ
request for qualifications

RHP
replacement housing payment

RIRS
Railroad Inspection Reporting System

RISE
Revitalize Iowa's Sound Economy

RISTIS
Rural Interstate Safety and Traveler Information System

RMS
resource management system

ROD
record of decision

ROW
right of way

RP
responsible party

RPA
regional planning affiliation

RPMs
raised pavement markers
revolutions per minute

RQ
reportable quantities

RR
railroad

RRLG
Railroad Revolving Loan and Grant (RRLG) Program

RT
reaction time

RTAP
Rural Transit Assistance Program

RTDP
Regional Transit Development Program

RTK-GPS
real-time kinematic global positioning system

RTOR
right turn on red

RTP
Regional Transportation Plan

RUTF
Road Use Tax Fund

RV
recreational vehicle

RWIS
Roadway Weather Information System

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S

SAFETEA-LU
Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users

SAN
storage area network

SAP
substance abuse professional

SBA
Small Business Administration

SCORT
Standing Committee on Rail Transportation

SC Zone
steering control zone

SCL
speed-change lane

SCS
Soil Conservation Service

SEOC
State Emergency Operations Center

SFY
state fiscal year

SGR
State of Good Repair (Initiative)

SHA
state highway agency

SHPO
State Historic Preservation Office

SHRP
Strategic Highway Research Program

SI
International System of Units (Metric)

SI&A
Structure Inventory and Appraisal

SIB
State Infrastructure Bank

SIC
Standard Industrial Code

SIP
State Implementation Plan

SME
special mobile equipment

SMS
Safety Management System

SOP
standard operating procedure

SOV
single occupancy vehicle

SPR
statewide planning and research

SRF
State Revolving Fund

SRTS
Safe Routes to School [program]

SSD
stopping sight distance

SSRS
Single State Registration System

STA
State Transit Assistance

STB
Surface Transportation Board

STIP
Statewide Transportation Improvement Program

STP
Surface Transportation Program
sewage treatment plant

STPP
Surface Transportation Policy Project

STT
Screening Test Technician (capitalized when referencing the statutorily required position)

STV
small target visibility

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T

TAC
Technical Advisory Committee

TANF
temporary assistance to needy families

TCCP
Technical Training and Certification Program

TCD
traffic control device

TCLP
total concentration leachate procedure

TCP
Traffic Control Plan

TDM
transportation demand management

TDS
total dissolved solids

TE
Transportation Enhancement

T&E
threatened and endangered (species)

TEA-21
Transportation Equity Act for the 21st Century

TEAM
transportation electronic management system

TEAP
Traffic Engineering Assistance Program

TDP
transportation development plan

TIF
tax increment financing

TIGER
Transportation Investment Generating Economic Recovery (Program)

TIGGER
Transit Investments for Greenhouse Gas and Energy Reduction (Program)

TIP
Transportation Improvement Program

TJ
transfer of jurisdiction (of highway authority)

TL
truckload

TMA
transportation management association

TMS
traffic monitoring system

T/O
tenant occupant

TODS
tourist-oriented directional sign

TOFC
trailer-on-flatcar

TPMS
Transportation Program Management Software
Transportation Programming Management System
Transportation Project Management System

TPWP
Transportation Planning Work Program

TRB
Transportation Research Board

TRIP
The Road Information Program

TSA
Transportation Security Administration

TSIP
Transportation Safety Improvement Program

TS&L
type, size and location

TSM
transportation system management

TSO
time sharing option

TSP
total suspended particulates

TSS
total suspended solids

TVM
transit vehicle manufacturer

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U

UCR
Unified Carrier Registration System

UCRA
Unified Carrier Registration Agreement

UHF
ultrahigh frequency

UFOV
useful field of view

ug
microgram

ug/m3
micrograms per cubic meter

ug/mg
microgram per megagram

ULS
Universal Licensing System

UP
Union Pacific Railroad Company

U.S.
United States

USDA
U.S. Department of Agriculture

U.S. DOT or USDOT
United States Department of Transportation

USC
United States Code

USGS
United States Geological Survey

USRA
United States Railway Association

UST
underground storage tank (for fuel)

U-STEP
Urban-State Traffic Engineering Program

UZA
urbanized areas

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V

V
design speed

VC zone
visual clear zone

VE
value engineering

VHF
very high frequency

VIN
vehicle identification number

VMT
vehicle-miles traveled (preferred, most common use to reference the number of miles that vehicles are driven)
vehicle-miles of travel
virtual machine technology
virtual management technologies
virtual method table

VOC
volatile organic compounds

VOR
vehicle occupancy rate

VPD
vehicles per day

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W

WBE
Women's Business Enterprise

WCSC
Waterborne Commerce Statistical Center

WEEM
waterway economic efficiency model

WIM
weigh-in-motion

WQS
water quality standards

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P

Q

R

S

T

U

V

W

X

Y

Z