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Summary of the Tool Evaluation for the areas of mobility, safety, environment, and integrating
results. Additionally, Table 4.1 lists specific analytical tools that
The analytical tools identified through the review were can be used to support asset management analyses consistent
evaluated to determine the degree to which they support the with the guidance presented below.
Interstate Asset Management Framework. Table 4.1 lists sys-
A general issue in considering the data and tools needed for
tems and tools currently maintained, support at least one step
asset management is that of degree of coverage. While it is
in the framework, and are available in the public domain and/or
generally agreed that good data supporting quantification of
through NCHRP research, from AASHTO or from FHWA.
qualitative policies, goals, and objectives often are required to
properly manage highway assets, and agreement that asset man-
4.4 Guidance on Data and Tools
agement decisions should be supported by data, there is debate
for IHS Asset Management
over what constitutes good data and exactly how that data
This section provides guidance on using available data and should be used. Generally, the more complete, accurate, and
tools for supporting the Interstate Asset Management Frame- timely the data, the more expensive it is to collect. In determin-
work. Guidance is provided for each asset category, as well as ing the extent to which data should be collected for the Inter-
Table 4.1. Analytical tool summary.
Tool System Type Available From Notes
AssetManager NT Investment analysis AASHTO Integrates investment analysis
results from multiple sources
AssetManager PT Needs and Project AASHTO Prioritizes projects based on
Evaluation user-specified measures
BCA.Net Needs and Project FHWA Performs benefit/cost analysis
Evaluation for highway improvements
BLCCA Needs and Project NCHRP Bridge preservation life cycle
Evaluation cost analysis
DIETT Risk Assessment NCHRP Prioritizes risks to transportation
choke points
HDM-4 Investment Analysis McTrans, Presses Simulates highway investment
de l'ENPC (Paris) needs, condition and
performance
HERS-ST Investment Analysis FHWA Simulates highway investment
needs, condition and
performance
IDAS Needs and Project McTrans and Evaluates network impact of ITS
Evaluation PCTrans improvements
MOOS Bridge Needs and Project NCHRP Assist in developing bridge-level
Level Model Evaluation strategies using data from
Pontis. Also can be used to
prioritize investments to mitigate
bridge risks
MOOS Network Investment Analysis NCHRP Uses data from the bridge-level
Level Model model to perform multi-objective
analysis
NBIAS Investment Analysis FHWA Simulates bridge investment
needs, condition and
performance
PONTIS Management System AASHTO BMS licensed by most U.S.
state DOTs
REALCOST Needs and Project FHWA Performs benefit/cost analysis
Evaluation for pavement projects
STEAM Needs and Project FHWA Evaluates network impact of
Evaluation multimodal improvements
TRNS*PORT Results Monitoring AASHTO Supports preconstruction,
contracting, and construction
management
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state Asset Management Framework, it is important to weigh IHS owners should use a BMS for assessing current condi-
the cost of data collection against the cost of poor decisions tions, setting performance and budget targets, and identifying
from incomplete or inaccurate data. Also, it is important to candidate projects when updating the capital plan for struc-
consider the possible use of the data for supporting asset man- tures. Pontis and other agency-specific systems that support
agement, and try to avoid the situation whereby an IHS owner analysis of element or component-level conditions provide a
collects too little data to support asset management decisions strong basis for implementing the Interstate Asset Manage-
or, alternatively, more data than can practically be put to use in ment Framework. NBIAS provides sufficient support for as-
a systematic manner. The guidance below has been developed sessing current conditions and setting performance and budget
considering the need to find a balance between these extremes. targets for bridges. Spreadsheet analyses, preferably calibrated
using a BMS or NBIAS, may be used to support setting per-
Roadways. IHS owners should collect roadway inventory formance and budget targets.
and inspection data consistent with HPMS reporting require-
ments on an annual basis. All IHS sections should be treated Safety Features and Facilities. IHS owners should
as HPMS sample sections, implying the full set of HPMS data collect inventory and condition data for all assets listed in
items should be quantified for each section. Further, IHS Table 2.1, including safety features, facilities, and shoulders,
owners should collect additional measures of pavement condi- sufficient for estimating the asset extent and the percent of
tion consistent with the requirements of COTS pavement man- the extent functioning as intended. A maintenance manage-
agement systems and expected future HPMS requirements. ment system, which supports a maintenance quality-assurance
Agencies should use a pavement management system for approach for assessing current conditions and setting perfor-
assessing current conditions, monitoring performance trends, mance and budget targets by asset category, provides support
setting performance and budget targets, and identifying for IHS asset management. Alternatively, an RSL approach can
candidate projects when updating the capital plan for pave- be used, particularly for discrete assets with known construc-
ments. Existing COTS and agency-specific systems that support tion dates, such as facilities. The Asset Management Data
measures of roughness, cracking, faulting and rutting pro- Collection Guide (13) recommends specific data items to
vide sufficient support for implementing the Interstate Asset collect for selected asset types, including signs, pavement
Management Framework. An RSL approach is recommended markings, and guardrails. Also, this guide recommends cri-
for modeling pavement needs. Where possible, survival analy- teria for determining what data to collect as part of an asset
sis should be used to establish pavement deterioration models management data collection and is a particularly valuable
considering relevant performance risk. HERS-ST should be reference for determining what data to collect for assets
run to validate the results obtained from an agency's PMS, or classified here as safety features.
to act as a substitute for assessing conditions and setting per-
formance and budget targets where an agency lacks a PMS. Mobility and Safety. IHS owners typically have basic data
required for mobility and safety. The mobility-related data
Structures. IHS owners should collect inventory and con- items required for the Interstate Asset Management Frame-
dition data on all structures, preferably on a two- to four-year work are collected for HPMS sample segments. IHS owners
basis. This guidance applies to bridges and other nonbridge should collect HPMS sample data for their entire IHS. IHS
structures--tunnels, culverts/drainage structures, noise barrier owners already have access to counts of crashes and fatalities.
walls, retaining walls, overhead sign structures, and high mast IHS owners should use HERS-ST to help set targets and
light poles--as all of these structures have the potential to fail predict future values for mobility and safety measures. Agency
catastrophically, and thus lead to system failure (closure of a travel demand models, where available, can be used in con-
portion of the IHS for some period) and possibly loss of life. junction with HERS-ST to more accurately assess current
Bridge data are already collected for IHS bridges consistent conditions and provide better estimates of future traffic.
with NBI requirements. In addition to collecting NBI data,
IHS owners should collect inventory and condition data for Environment. For this area the primary challenge is in
all structures at the element or subcomponent level. NBI data defining a set of environmental performance measures, as
is collected at the component level--deck, superstructure, described in Chapter 5. At a minimum, IHS owners should
and substructure. These data provide an overall picture of document environmental goals and commitments for IHS
bridge condition, but are not sufficient for identifying specific assets, and track the degree to which they meet these commit-
bridge preservation projects such as painting and repairs to ments on an annual basis. The prototype Environmental
elements such as bearings or joints. Element level data pro- Information Management System developed through NCHRP
vides the finer level of detailed condition required to identify Project 25-23 (2) (19) can be used to support an agency's com-
candidate projects. mitment tracking process.
