Life Cycle Cost Analysis

Constructing, repairing, and rehabilitating the roadways of today need to not only account for costs related to construction, but to the impact to the motoring public.

ARMA has helped in creating a Life Cycle Cost Analysis (LCCA) methodology for NYS that measures both the costs related to construction and the impact on the motoring public. The methodology evaluates and models a number of costs that includes:

  • • Construction and planning related costs
  • • Impact of delay on motorists
  • • Assess motorist safety in work zone periods
  • • Impact to motorists’ vehicles

The methodology evaluates costs over a specified analysis period that can span over 30 years of construction related activities. The roadways that can be modeled include large highways to busy streets in cities.

The methodology is tailored to New York State but can be modified to any municipality or state depending on readily available data. It is composed of a number of modules that are used to determine the agency cost and user cost that are incurred over the lifetime of a roadway. The agency cost involves the cost of construction and related expenses. This cost is the easier value to evaluate. The other category of cost is the user cost. This is the implied cost that the motoring public incurs while traveling the roadway under analysis. This includes cost such as extra travel time, safety in work zones, impact to vehicles, and other related costs. These costs are evaluated through modules within the methodology.

Value of Time

This module arrives at a dollar value to be assigned to a particular time period. The methodology takes into account the activities that occur at a particular time, particular day, and the location within the roadway segment that is under consideration. Each class of activities is assigned a specific hourly value. Quantifying the percent of motorists that are involved in each activity class in each time period and at each location within the roadway is used in arriving at a value of time.

Delay Time

When a motorist travels through a work zone, they may need to reduce their speed. This has the effect that it will take longer to travel through the same roadway segment than if the work zone was not present. The extra time is measured and factored in the user cost.

Work Zone Safety

The costs that are measured here are statistical in nature. This involves historical accident rates and their dollar values being applied to future accidents. The result arrives at a statistical cost.

Vehicle Operating Cost

There is a cost to vehicles that experience speed changes and various roadway conditions. This module arrives at a dollar value that captures this cost.

Comparing Work Zone Configurations

There are many ways in protecting work crews and the motoring public during periods of construction. This module allows the comparison of different maintenance and protection of traffic scenarios. From simple lane closures to complex detour routes can be modeled and analyzed.

Comparing Work Zone Configurations

This module provides a comparison between similar design alternatives and a base case to determine which design alternative provides the greatest benefit. The design alternative that yields the lesser user cost with the smallest increase in agency cost have the most benefit.