About the TomTom Traffic Index

From TomTom.com

With the publication of the TomTom Traffic Index we are aiming to provide the general public, industry and policy makers with unique and unbiased information about congestion levels in urban areas*.

The methodology that is used in this report compares travel times* during non-congested periods (free flow*) with travel times* in peak hours*. The difference is expressed as a percentage increase in travel time*. We take into account local roads, arterials and highways. All data is based on actual GPS based measurements and for each city* the sample size is expressed in total number of measured kilometres for the period.

A comparison is made for the travel times* during the quarter and this is compared with the same period a year ago.

As well as assigning and ranking the overall congestion levels of over 50 cities*, the report analyses the congestion levels* in cities at different times of the day and on different days of the week.

Individual city reports include more detailed information such as the most congested day*, average free flow speed*, time delay per year for commuters* and congestion levels on highways* and local roads.

LINK: TomTom Americas Traffic Index 

• pg5 -- Honolulu 6th worst in N America
• pg27 -- Honolulu 28% Congested (details)