Reduce the average buffer time needed to arrive on-time for 95 percent of trips on (specified routes) by X minutes over Y years.

Associated Performance Measures

The buffer index represents the extra time (buffer) most travelers add to their average travel time when planning trips. This is the extra time between the average travel time and near-worst case travel time (95th percentile). The buffer index is stated as a percentage of the average travel time. Average buffer index or buffer time can be calculated using miles traveled as a weighting factor. Buffer time = 95th percentile travel time (min) – average travel time (min).

Service Packages that Support the Objective

TI01-Broadcast Traveler Information
TI02-Personalized Traveler Information
TI03-Dynamic Route Guidance
TI07-In-Vehicle Signage
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
VS05-Curve Speed Warning
VS08-Queue Warning
VS09-Reduced Speed Zone Warning / Lane Closure
VS10-Restricted Lane Warnings

Associated Goals

Improve the efficiency of the surface transportation system
Improve the resiliency and reliability of the surface transportation system

Planning Factors

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


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.