Agenda Background The selected solution ICTCT 2017 Olomouc Data - - PDF document

ICTCT 2017 Olomouc

Red light walking, transportation time and attitudes in crossing with intelligent green light for pedestrians

Niels Agerholm

Head of Division

Aalborg University

Agenda

• Background
• The selected solution
• Data
• Results
• Summary

Background

• More vulnerable road users (VRU) (here

pedestrians) are desired

• Most accidents with VRU in intersections
• The targets are:

– To make it safer and easier for VRU – To increase the capacity of urban intersections

The selected solution I

• Smart green light for pedestrian

(based on real time pedestrian registrations)

– Radar-based – Green light (somehow) independent from each road side

• No max. circulation time
• Improved detection
• Improved signal programs and more

coordination between intersections

The selected solution II Where?

• Aarhus: 225,000 inhabitants
• Intersection: Christian 10.

Vej/Central ring road

• ADT: +20,000

Data I

• Questionnaire data:
• Short road side questionnaires (filled in on iPads)
• 72 persons before and 53 after
• Attributes:

– Gender, – Age, – User frequency, – waiting time, – red light walking, – waiting frequency on refugee island, – security, – estimated waiting time

Data II

• Video recording:

– 2 two-weeks periods – 5:00-21:00 – 266+318 hours of recording

• Time of passage – one day

– 173 before – 164 after

• Red-light walking – the full data set

– 1,397 before – 1,474 after

• RUBA used for data selection >> 99%

reduced time use

Results I – Experiences

• Questionnaire data

Before After p-value

Often waiting for Green light (yes) 74% 66% 0,1022 Sufficient time to cross (yes) 32% 45% 0,1648 Passage after change to Red light (rare/never) 42% 68% 0,0014 Waiting on refugee island (rare/never) 67% 83% 0,1894 Security (yes/yes mostly) 75% 78% 0,2322 Own assessment of waiting time 0,7130

Test: Fisher’s exact test

Results II – Time of passage

• Video recording

Interval [s] Peak period Off-peak period Befor e After Before After 0-30 15% 20% 25% 34% 31-60 28% 36% 46% 30% 61-90 27% 21% 21% 36% 91-120 26% 15% 0% 0% 121-150 4% 7% 8% 0% 151-180 0% 2% 0% 0% Mean time [s] 67.6 62.3 51.3 45.7 Test p-value Reduction in peak period 0,24325 Reduction in off-peak period 0,36786

Pedestrian area 2 Cross for red: 241 Finish with red: 915 Green light walking: 318 Pedestrian area 1 Cross for red: 233 Finish with red: 16 Green light walking: 1225 Pedestrian area 2 Cross for red: 608 Finish with red: 330 Green light walking: 459 Pedestrian area 1 Cross for red: 229 Finish with red: 13 Green light walking: 1155

Before After

Results III – Red-light walking

• Video recording

– Red-light walking

• Area 2 – Big effect: from 44 to

16%

• Area 1: No effect: 16%

Test P-value Area 2 2,20E-16 Area 1 0,8441

Area 2 Area 1

Summary

• New, advanced pedestrian focused signal

system has been implemented in the City of Aarhus

• Main results:

– Pedestrians experienced more easy passability – The measured time used for passage is reduced 5- 6 sec. (no statistically significants) – The share of red light walking pedestrians is reduced from 44 to 16%

Thank You☺

Niels Agerholm Division of Transportation Engineering

• Dep. of Civil Engineering

Aalborg University +45 61 78 04 55 na@civil.aau.dk Rasmus Øhlenschlæger Division of Transportation Engineering

• Dep. of Civil Engineering

Aalborg University ro@civil.aau.dk Charlotte Tønning Division of Transportation Engineering

• Dep. of Civil Engineering

Aalborg University cht@civil.aau.dk