Dutch driving behavior analyses | Norbert Ligterink

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Presentation transcript:

Dutch driving behavior analyses | Norbert Ligterink

Update Analysis according to RDE (description in 2nd package + explanation HS) Filtering, Trip composition, Sample size Results Dutch trips Rural + motorway: results do not contradict Commission proposal (based on analysis HS of WLTP-database) Urban: higher v*apos-[95] – approx. 20 m2/s3 (intersection 19 m2/s3, compared to approx. 10 m2/s3 in Commission proposal) Under discussion: Dutch approach (chase car) appropriate for Urban driving? (v*apos-[95] dominated by aggressive driver?; no trips in range 5 – 10 m2/s3?) more or less fixed vehicle followed (single lane traffic) limited time free-flow Professional driver behaviour: no impact on results 2 | Dutch driving behavior 25 September 2015

using distance-average velocity 90 and above 60-90 0-60 3 | Dutch driving behavior 25 September 2015

Trip lengths trips designed for equal shares urban/rural/Mway “natural trip”: urban start  rural  motorway  rural  urban stop combining two trips for a 50-120 minute trips 4 | Dutch driving behavior 25 September 2015

Hanning filter (N=3, SPSS) raw acceleration: ai+1/2 = (vi+1-vi)/3.6 Hanning filter (smoothing, as in SPSS, combined with Heinz definition of acceleration): vi = 0.25*vi+1 + 0.5*vi + 0.25*vi-1 ai = (vi+1-vi-1)/(2*3.6) = (0.125*vi+2 + 0.25*vi+1 - 0.25*vi-1 - 0.125*vi-2)/3.6 centrepoint definition from Heinz: additional smoothing 5 | Dutch driving behavior 25 September 2015

Driver experience urban driving: more or less fixed vehicle followed (single lane traffic) limited time free-flow (no car in front) (automatic gear AUDI) rural and motorway driving: following cars for at least 2-3 kilometres (limited vehicle variation) large variation in driving styles observed a number of times “let cars go” because of speed limit violations 6 | Dutch driving behavior 25 September 2015

Effect of minimal sample size affecting mainly rural data on this data 7 | Dutch driving behavior 25 September 2015

effect of the velocity definition 8 | Dutch driving behavior 25 September 2015

Effect of filtering/smoothing 9 | Dutch driving behavior 25 September 2015

Effect of the 90-minute trip length (two-trip combinations) 10 | Dutch driving behavior 25 September 2015

The percentiles of valid trips discarding 5% of the trips as driving boundary 11 | Dutch driving behavior 25 September 2015

Thank you for your attention