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case study

Measure the impact

THE challenge

City planners are required to measure the impact on an intersection upgrade works that included a second right turn lane. Typical data provides travel time information for a road segment that includes an aggregation of all turning movements, with no transparency behind the aggregated values to see the quality and quantity of raw data used.

THE SOLUTION

Using a single day for an evaluation is not ideal, Addinsight allows you to choose a date range that only includes specific days of the week and excludes public and school holidays, within a single request.

Using the link selection function enabled planners to gather all the necessary data. The function allows you to filter data to probes that travel from green to red and then travelled to one of the yellow locations that differentiate between the left and right turns.

BEFORE …

The following chart shows the 15th, 50th and 85th percentile travel times for one month of right turn travel times.

It shows that the right turn’s delays are greatest when competing against the heavy inbound flow in the morning. The higher demand for the right turn in the evening also causes some delays, but it has less conflicting traffic and can therefore receive a greater share of the green time in a cycle.

AFTER …

The range of the travel time between the 15th and 85th percentiles has also narrowed and there is no discernible change in travel time across the day.

The Value Created

The duplication of the right turn lanes has reduced congestion and afforded predicable travel times across the day. It also enabled the SCATS controller to redistribute its green time to other traffic movements as seen in the table below improving intersection efficiencies in optimising throughput of vehicles.

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