Institut français des sciences et technologies des transports, de l’aménagement et des réseaux

Institut français des sciences et technologies des transports, de l’aménagement et des réseaux

www.ifsttar.fr

Institut françaisdes sciences et technologiesdes transports, de l’aménagementet des réseaux

Speed limiter, a tool to reduce speeding?

Corinne BRUSQUEMyriam HUGOTArnaud BONNARD


www.ifsttar.fr

Speed, a road safety issue

• a main cause of road crash• a major contributory factor in 30% of fatal

crashes [TRB, 1998]• a direct influence on accident severity

• Implementation of safety interventions to reduce speeding behaviour

257 4864882915

callto:4864882915


www.ifsttar.fr

Speed regulation systemsSpeed alert

Speed limiter

Intelligent Speed

Adaptation

Cruise control

Adaptative cruise control


www.ifsttar.fr

Speed limiter

A in-built system that supports the driver in not exceeding a pre-selected speed by limiting the throttle

• 4 controls • 1 select CC, SL or no system• 2 Store the speed, decrease the selected speed.• 3 Disengage and engage the system• 4 Store the speed, increase the selected speed.


www.ifsttar.fr

Interaction project

Who are the IVT users and non users?Where, when, how and why drivers use IVT?What are the real effects of IVT on driving?


www.ifsttar.fr

Interaction project

Where and how drivers use SL?


www.ifsttar.fr

Equipment

in-built Cruise Control (CC)

in-built Speed Limiter (SL)

nomadic navigation device

Bluetooth hands-free car kit

A small-scale Naturalistic Driving Study (1/3)5 instrumented vehicles

Peugeot 308 Peugeot 207 SWRenault Clio Estate

Min. 4 weeks


www.ifsttar.fr

A small-scale Naturalistic Driving Study (2/3)

Drive as you normally would, both regarding your journeys and your driving style.Use the equipmentaccording to your habits.

• N=16 drivers• 10 6• Age: 33 - 50 years

Participants

valid driving license >10 years

normally use a speed regulation system >50% of trips

drive >2000km per month

use mobile phone while driving (no specified frequency)


www.ifsttar.fr

A small-scale Naturalistic Driving Study (3/3)


www.ifsttar.fr

SL use rate according to road types

• 8 SL users among the 16 drivers• 51 hours of SL use• SL use rate = 17 % of time driven with SL on• No effect of road types on SL use rate

SL use rate on urban roads SL use rate on rural roads SL use rate on highways0.00%

2.00%

4.00%

6.00%

8.00%

10.00%

12.00%

14.00%

16.00%

18.00%

20.00%


www.ifsttar.fr

SL users strategies

8 drivers

usersstrategies


www.ifsttar.fr

37%

23%

40%

urban roadsrural roadshighways

Mainly highway SL usersSL speed distribution

• SL speed on highway is in average 5 km/h above the legal speed limit• No change of the SL speed when they get away from highway

Driving time by road type

Driver 416

41-5

5

46-5

0

51-5

5

56-6

0

61-6

5

66-7

0

71-7

5

76-8

0

81-8

5

86-9

0

91-9

5

96-1

00

101-

105

106-

110

111-

115

116-

120

121-

125

126-

130

131-

135

136-

140

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000


www.ifsttar.fr

40-4

5

46-5

0

51-5

5

56-6

0

61-6

5

66-7

0

71-7

5

76-8

0

81-8

5

86-9

0

91-9

5

96-1

00

101-

105

106-

110

111-

115

116-

120

121-

125

126-

130

131-

135

136-

140

141-

145

146-

150

0

1000

2000

3000

4000

5000

6000

7000

8000

Mainly rural road SL usersSL speed distribution

• The SL speed fits the legal speed limit of rural roads• No change of the SL speed when they get away from rural to urban roads


38%

22%

40%


Driver 402


www.ifsttar.fr

40-4

5

46-5

0

51-5

5

56-6

0

61-6

5

66-7

0

71-7

5

76-8

0

81-8

5

86-9

0

91-9

5

96-1

00

101-

105

106-

110

111-

115

116-

120

121-

125

126-

130

131-

135

136-

140

141-

145

146-

150

0

500

1000

1500

2000

2500

3000

3500

4000

44%

38%

17%


Mixed road SL usersSL speed distribution

• Change of the SL speed according to the legal speed limit


Driver 412


www.ifsttar.fr

The different SL states (1/2)

SL off SL on

90 km/h 130 km/h 90 km/h 50 km/h

135 km/h

SL off SL usefull SL useless

Legal speed limit

SL speed

2 SLstates

3 SLstates


www.ifsttar.fr

The different SL states (2/2)

urban roads

rural roads

highways

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

84.2%

81.1%

81.0%

6.8%

8.3%

3.3%

9.0%

10.6%

15.7%

% Hours driven SL OFF % Hours driven SL ON & useless % Hours driven SL ON & usefull


www.ifsttar.fr

Conclusion• A pilot study due to the size of the sample• SL speed selected

• above the legal speed limit • In order to avoid speed fines

• Preferential context of SL use• Highways• Rural roads

• Why• Drivers aware that the frequency of speed control differ

according to the roads• Unaware that speeding is also a issue in urban area mainly for

VRU


www.ifsttar.fr

Thank for your attention

Corinne BRUSQUE, PhDIFSTTAR - LESCOT25 avenue François Mitterrand69675 Bron CedexFranceemail : [email protected]

Documents

Institut français des sciences et technologies des transports, de l’aménagement et des réseaux