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Safety 2018, 4(1), 10; https://doi.org/10.3390/safety4010010

Speed Responses to Speed Humps as Affected by Time of Day and Light Conditions on a Residential Road with Light-Emitting Diode (LED) Road Lighting

1
Calluna AB, Hästholmsvägen 28, 131 30 Nacka, Sweden
2
Environmental Psychology, Department of Architecture and Built Environment, Lund University, 221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Received: 3 January 2018 / Revised: 26 February 2018 / Accepted: 7 March 2018 / Published: 13 March 2018
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Abstract

The speed-reducing effect of speed humps during darkness is important to ensure a consistent speed reduction and a decreased probability of accidents during darkness. This study examined the effects of speed humps, compared with a control location, on a residential road in Sweden with light-emitting diode (LED) street lighting and a 30 km/h posted speed limit. Hypotheses tested were that: (I) vehicle speed is higher during daylight than in darkness; (II) speed at speed humps is lower than at control locations during both daylight and darkness; (III) speed at humps is higher during daylight; (IV) vehicle speed at humps is lower when luminance or visibility of the humps is greater; and, (V) the road environment of speed humps is perceived as being similar by drivers. The results showed that vehicle speed at the control location was negligibly higher (+0.3 km/h) during daylight than in darkness. Speed humps reduced driving speed by 20% when compared with the posted speed limit and the effect was not significantly different between daylight and darkness. Speed reduction for the three speed humps varied between 9% and 29% as compared with the posted speed limit. In this study, the LED road lighting that was placed directly above or in front of the hump achieved the highest luminance. This study could not reveal any significant differences in vehicle speed attributable to light conditions per se. View Full-Text
Keywords: speed-reduction; measures; street; lighting; day; night; traffic calming speed-reduction; measures; street; lighting; day; night; traffic calming
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Jägerbrand, A.K.; Johansson, M.; Laike, T. Speed Responses to Speed Humps as Affected by Time of Day and Light Conditions on a Residential Road with Light-Emitting Diode (LED) Road Lighting. Safety 2018, 4, 10.

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