Traffic Jam Warning System, Gothenburg - SWEDEN

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Roland Waters
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1 Traffic Jam Warning System, Gothenburg - SWEDEN Christer Olsson Swedish National Road Administration [email protected] Location: One of the main entrance to Gothenburg south bound direction 4 lane motorway (2+2). Length of installation: 4,7 km Traffic flow: 5-75 vehicles/mid-week-day Purpose: Reduce the effects of an eventual traffic jam. Goal: Reduce the frequency of serial accidents with 2 %. VIKING Conference Copenhagen 24/1 25 Christer Olsson 2 Name of Author 1

Length of installation: 4,7 km Traffic flow: 5-75 vehicles/mid-week-day Purpose: Reduce the effects of an eventual

2 Start: 1 september 21 Costs: ~,7 milj Installation: 7 sections of warning signs 9 sections of microwave detectors VIKING Conference Copenhagen 24/1 25 Christer Olsson 3 VIKING Conference Copenhagen 24/1 25 Christer Olsson 4 Name of Author 2

VIKING Conference Copenhagen 24/1 25 Christer Olsson 3

3 Managing criteria: Detector Treshold value Speed (km/h) hysteres Occupandy (%) Treshold value hysteres Elapsed time (s) Speedlimit D1x D2x km/h D3x D9x km/h - Elapsed time refers to the period of time over which sliding treshold value is estimated VIKING Conference Copenhagen 24/1 25 Christer Olsson 5 Traffic flow development: Vehicles per day: Tingstadsmotet-Bäckebolsmotet Åmvd Maximum hour Year ÅMVD Max T mot C Poly. (ÅMVD) Åmvd = Anual mid-week-day A yearly traffic growth of 2-3 % during the last 4 years. In Sweden in general ~1,7 %. The Gothenburg region has during the last years had a good economic development. VIKING Conference Copenhagen 24/1 25 Christer Olsson 6 Name of Author 3

Tingstadsmotet-Bäckebolsmotet Åmvd 9 8 7 6 5 4 3 2 1 35 3 25 2 15 1 5 Maximum hour 23 22 21 2 1999 1998 1997 1996 1995 1994 1993 Year ÅMVD Max T mot C Poly.

4 Congestgion effects within a short period time: Congestgion measuring maj-1 Before opening to 17 fr 18 må 28 ti 29 on 3 to 31 Congestgion measuring dec-1 After opening ( the opening of the traffic jam warning system did coincide with the opening of more lanes downstream the system) må 1 ti 11 on 12 to 13 fr 14 VIKING Conference Copenhagen 24/1 25 Christer Olsson 7 Congestgion effects in the long run: Congestgion measuring maj-4 må 15 ti 16 on 17 to 18 fr 19 The present congestion situation is worse than it was in the spring 21 before the opening of the system. The increase in traffic flow was ~ 7-9 %. Congestgion measuring nov/dec må 29 ti 3 on 1 to 2 fr 3 VIKING Conference Copenhagen 24/1 25 Christer Olsson 8 Name of Author 4

Congestgion effects in the long run: 25 2 15 1 5 Congestgion measuring maj-4 må 15 ti 16 on 17 to 18 fr 19 The present congestion situation is worse than it was in the spring 21 before the

5 Speed effects: ( Based on a value called lowest point speed = average speed on a 5 min interval in a certain section) Day of the week Thursday Friday Monday Tuesday Wednesday 17/5-1 18/5-1 28/5-1 29/5-1 3/5-1 Time 15,4-17,55 14,2-17,15 6,5-9,2 7,15-8,3 - Lowest point speed (km/h) Before opening Day of the week Monday Tuesday Wednesday Thursday Friday 1/ / / / /12-1 Time - 7,3-8, - 15,4-16,2 14,4-17,1 Lowest point speed (km/h) After opening Day of the week Time Lowest point speed (km/h) ~ 3 years after opening Monday Tuesday Wednesday Thursday Friday 15/5-4 16/5-4 17/5-4 18/5-4 19/5-4 7,3-8,35 7,3-9,1 16,-18,3 15,4-19,5 14,3-17,55 VIKING Conference Copenhagen 24/1 25 Christer Olsson Development of serial accidents (south bound direction): Total amount of transportation work, ~ 14 vehicles kilometers. VIKING Conference Copenhagen 24/1 25 Christer Olsson 1 Name of Author 5

14/12-1 Time - 7,3-8, - 15,4-16,2 14,4-17,1 Lowest point speed (km/h) 65 6 65 73 3 After opening Day of the week Time Lowest point speed (km/h) ~ 3 years after opening Monday Tuesday Wednesday

6 Development of serial accidents on comparable road sections in the Gothenburg area: VIKING Conference Copenhagen 24/1 25 Christer Olsson 11 Summary: Traffic intensity on the stretch is larger than ever. Congestion situation is worse than ever. Average speed during congestion time is lower than ever. The number of serial accidents is lower (~3 %) than it was before the system was implementet and does not follow the same trend as it does on a comparable road stretch in the Gothenburg area. VIKING Conference Copenhagen 24/1 25 Christer Olsson 12 Name of Author 6

Average speed during congestion time is lower than ever.

7 VISION In an 1 year sight the idea of an traffic jam warning system could mean 4 km of system instead of 4,7 km. VIKING Conference Copenhagen 24/1 25 Christer Olsson 13 Name of Author 7

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