This Alabama Statewide Mobility Report for 2014 is a new way to analyze interstate mobility performance over an entire year. Over half a billion speed records were acquired, stored, and analyzed for this report. These observations capture recurring congestion events (queues during peak periods, weekend travel, etc.) and nonrecurring congestion (crashes, special events, and other activities). Four metrics were established that provide a detailed look at each interstate’s performance by month. These metrics looked at the amount of time (either by month or over the entire year) that speeds were above or below certain thresholds. Each metric is explained and provides different insight depending on the characteristics of each interstate (length, urban or rural, posted speed limit, etc.). This report could be compiled on an annual basis to compare year-to-year performance and quantify the mobility improvement due to interstate improvement projects.
A research effort was initiated to develop and test a methodology to estimate the extent to which urban congestion is produced by the routine presence...
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