Objective Category
System Reliability: Planning Time Index

Objectives in the area of travel time reliability aim to reduce the variability in travel time so that transportation system users experience a consistent and predictable trip time. Unexpected delay is reduced for people and goods. This category focuses on the planning time index. This reflects the amount of extra time that travelers need to add to free-flow (or posted speed limit) travel time in order to arrive on-time in almost all situations. The planning time index takes into account both recurring and non-recurring sources of delay.

Associated Objectives and Performance Measures

Objective	Performance Measure
Reduce the average planning time index for (specific routes in region) by X (no units) over the next Y years.	The planning time index represents the time that must be added to travel time at free-flow speeds or the posted speed limit to ensure on time arrivals for 95 percent of the trips. Planning time = 95th percentile travel time (minutes) – Travel time at free-flow speed or posted speed limit. Average planning time index or planning time can be computed using a weighted average over person miles traveled.
Reduce the average planning time for (specific routes in region) by X minutes over the next Y years.	The planning time index represents the time that must be added to travel time at free-flow speeds or the posted speed limit to ensure on time arrivals for 95 percent of the trips. Planning time = 95th percentile travel time (minutes) – Travel time at free-flow speed or posted speed limit. Average planning time index or planning time can be computed using a weighted average over person miles traveled.

Associated Planning Factors and Goals

Planning Factor	Goal
G. Promote efficient system management and operation;	Improve the efficiency of the surface transportation system
I. Improve the resiliency and reliability of the transportation system and reduce or mitigate stormwater impacts of surface transportation;	Improve the resiliency and reliability of the surface transportation system

Associated Service Packages

Service Package
MC06: Work Zone Management
TI01: Broadcast Traveler Information
TI02: Personalized Traveler Information
TI03: En-Route Guidance
TM03: Traffic Signal Control
TM04: Connected Vehicle Traffic Signal System
TM05: Traffic Metering
TM06: Traffic Information Dissemination
TM08: Traffic Incident Management System
TM20: Variable Speed Limits
TM21: Speed Harmonization
TM22: Dynamic Lane Management and Shoulder Use

Source

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