System Reliability: Variability (Objective Category)

Objectives in this category focus on improving travel time reliability by trying to reduce the variability of travel time.

Associated Objectives and Performance Measures

Objective	Performance Measure
Reduce the variability of travel time on specified routes by X percent during peak and off-peak periods by year Y.	Variance of travel time. Variance is the sum of the squared deviations from the mean. This can also be calculated as the standard deviation of travel time. Standard deviation is the square root of variance.

Associated Planning Factors and Goals

Planning Factor	Goal
G. Promote efficient system management and operation;	Increase operational efficiency and reliability of the transportation system

Associated Service Packages

Service Package
ATIS01: Broadcast Traveler Information
ATIS02: Interactive Traveler Information
ATIS04: Dynamic Route Guidance
ATIS09: In Vehicle Signing
ATIS10: Short Range Communications Traveler Information
ATMS03: Traffic Signal Control
ATMS04: Traffic Metering
ATMS06: Traffic Information Dissemination
ATMS08: Traffic Incident Management System
ATMS22: Variable Speed Limits
ATMS23: Dynamic Lane Management and Shoulder Use
MC06: Winter Maintenance
MC08: Work Zone Management
MC10: Maintenance and Construction Activity Coordination

Source

Planning for Operations Desk Reference

Since the mapping between objectives and service packages is not always straight-forward and often situation-dependent, these mappings should only be used as a starting point. Users should do their own analysis to identify the best service packages for their region.