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Wicklow County Council long term study into 3M DFS effectiveness and accuracy of 3M DFS units versus Metrocount data. 3M DFS 700 Units supplied and managed by Road Sign Services. Wicklow Data Analysis. Metrocount Data. Wicklow Speed Stats. Speed Stats By Hour. Traffic Speed Distribution.

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Wicklow County Council long term study into 3M DFS effectiveness and accuracy of 3M DFS units versus Metrocount data.

3M DFS 700 Units supplied and managed by Road Sign Services


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Wicklow Data Analysis effectiveness and accuracy of 3M DFS units versus Metrocount data.

Metrocount Data


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Wicklow Speed Stats effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Speed Stats By Hour effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Traffic Speed Distribution effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Speed Stats by hour effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Traffic Flow by Hour effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Summary of Metrocount Data effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • Data Captured Between 29/11/07 – 07/12/2007

  • Vehicle count – 142260 (both carriages)

  • Max recorded speed – 156.3kph

  • Mean speed – 75.0kph

  • 85%ile – 86.0kph


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Summary of 3M Data Southbound effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • Data Captured Between 01/04/08 – 08/04/08

  • Vehicle count – 42102

  • Entrance Speeds

  • Max recorded speed – 170kph

  • Mean speed – 80kph

  • 85%ile – 90kph

  • Average Speeds

  • Max recorded speed – 164kph

  • Mean speed – 79kph

  • 85%ile – 88kph


Summary of 3m data northbound l.jpg
Summary of 3M Data Northbound effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • Data Captured Between 01/04/08 – 08/04/08

  • Vehicle count – 27597

  • Entrance Speeds

  • Max recorded speed – 158kph

  • Mean speed – 79kph

  • 85%ile – 88kph

  • Average Speeds

  • Max recorded speed – 157kph

  • Mean speed – 77kph

  • 85%ile – 86kph


Summary of 3m data l.jpg
Summary of 3M Data effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • Southbound Reduction in:

  • Max recorded speed – 12kph

  • Mean speed – 2kph

  • 85%ile – 4kph

  • Northbound Reduction in:

  • Max recorded speed – 2kph

  • Mean speed – 4kph

  • 85%ile – 4kph

    N.B. Exit speed is obtained by doubling difference between entrance and average speed. Exit speed is not shown due to issues with accuracy based upon a single point of measurement.


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Summary of 3M Data Southbound effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • Data Captured Between 24/08/08 – 10/10/08

  • Vehicle count – 135168

  • Entrance Speeds

  • Max recorded speed – 174kph

  • Mean speed – 78kph

  • 85%ile – 90kph

  • Average Speeds

  • Max recorded speed – 171kph

  • Mean speed – 77kph

  • 85%ile – 88kph


Summary of 3m data northbound13 l.jpg
Summary of 3M Data Northbound effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • Data Captured Between 07/09/08 – 14/10/08

  • Vehicle count – 135168

  • Entrance Speeds

  • Max recorded speed – 148kph

  • Mean speed – 78kph

  • 85%ile – 89kph

  • Average Speeds

  • Max recorded speed – 145kph

  • Mean speed – 76kph

  • 85%ile – 87kph


Summary of 3m data14 l.jpg
Summary of 3M Data effectiveness and accuracy of 3M DFS units versus Metrocount data.

Q1 2008 data

Q3/Q4 2008 data

  • Southbound Reduction in:

  • Max recorded speed – 12kph

  • Mean speed – 2kph

  • 85%ile – 4kph

  • Northbound Reduction in:

  • Max recorded speed – 2kph

  • Mean speed – 4kph

  • 85%ile – 4kph

    N.B. Exit speed is obtained by doubling difference between entrance and average speed. Exit speed is not shown due to issues with accuracy based upon a single point of measurement.

Southbound Reduction in:

Max recorded speed – 6kph

Mean speed – 2kph

85%ile – 4kph

Northbound Reduction in:

Max recorded speed – 4kph

Mean speed – 4kph

85%ile – 4kph


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Comparison of Metrocount and 3M data sets. effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Speed Stats By Hour Metro effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Speed Stats by hour 3M effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Traffic Speed Distribution Metro effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Traffic Speed Distribution 3M effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Traffic Flow by Hour Metro effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Traffic Flow by Hour 3M effectiveness and accuracy of 3M DFS units versus Metrocount data.


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Conclusions effectiveness and accuracy of 3M DFS units versus Metrocount data.

  • The 3M units are a Speed Information Display. Primary purpose is to reduce traffic speed if needed

  • Vehicle counts will always be considerably lower as the unit does not classify / distinguish a single vehicle from a line of closely spaced traffic

  • 3M data / charts concur in most cases with Metrocount data, considering different locations / dates.


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Conclusions Cont’d effectiveness and accuracy of 3M DFS units versus Metrocount data.

3M units over the 100m detection range have reduced average and mean speeds by up to 6%, this does not include the additional speed reduction after the sign as driver ‘recover’ from their speed check.


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Conclusions Cont’d effectiveness and accuracy of 3M DFS units versus Metrocount data.

Even after 12 months, the signs have maintained their effectiveness, seeing reductions in drivers speeds comparable with the reading taken just after installation.


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Thanks for Listening effectiveness and accuracy of 3M DFS units versus Metrocount data.