Traffic safety for cyclists in roundabouts: geometry, traffic, and priority rules: A literature review

Download

The aim of this study was to carry out a literature review of roundabout geometric characteristics and traffic management regulations addressing the safety for cyclists. The literature review examined articles from 1990 until 2017. An article was considered relevant as follows:

  • Investigation of the relationship between roundabout geometric design and cyclist accidents (2 articles)
  • Investigation of the relationship between roundabout geometric design and cyclist operation/interaction with other traffic, i.e., motorised vehicles (4 articles)
  • Investigation of any safety impacts of the conversion of intersections into roundabouts for cyclists (9 articles)
  • Psychological/behavioural studies of cycling at roundabouts (5 articles)

The results show that the impact on cyclist safety is not as clear as for motorised vehicles with some studies showing a deterioration for cyclists (Jensen, 2013; 2016; Daniels et al. 2008; 2009). The cycle facility type (e.g., mixed traffic, cycle lane, and cycle path) and the priority rules have the potential to increase safety for cyclists. For example, the priority rules vary among different countries and within some countries.

From the literature, which priority rules provide the safest cycling environment remain unclear in terms of number of accidents and injury severity. The identified priority strategies are: (i) cyclists always yield to vehicles, (ii) shared yielding responsibility, (iii) vehicles always yield to cyclists, and (iv) an alternate solution ‘with’ and ‘without’ priority based on special characteristics (e.g., presence of vulnerable road users, geographic location). Furthermore, cycle lanes are the most unsafe cycle facility compared to mixed traffic or cycle paths. Likewise, coloured cycle lanes at roundabouts are less safe than non-coloured cycle lanes (Jensen, 2016). On the other hand, it is recommended that cyclists should ride in front of or behind vehicles in mixed traffic at single-lane roundabouts and in the middle of the lane, and should not ride parallel with vehicles (Cumming, 2012).

Some research directions are highlighted. The impact of the different priority rules needs further investigation in terms of number of accidents and injury severity. Some questions to study include: (i) what the best priority strategy is; (ii) what special road markings should be used; (iii) what the best distance is to place the cycle path from the circulatory roadway. Another research direction is to establish the impact on cyclist safety of cycle lanes at roundabouts. Finally, the impact on traffic safety, by cycling in the middle of the lane, needs further investigation as well.

MEET US


20
Mar

Lunch seminar in transport economics

Professor Stef Proost, KU Leuven presents "What Role for Electric Vehicles in Decarbonizing the Car Sector in the EU?"
16-18
Oct

European Road Profile User's Group, ERPUG

Welcome to the sixth ERPUG meeting in Vilnius, Lithuania. 
25-27
Aug

ICTTP 2020

ICTTP, International Conference on Traffic and Transport Psychology, is held in Gothenburg, Sweden.

LATEST NEWS


2019-02-21

Several actors collaborating on HCT vehicles

The increasing amount of freight, congestion on the roads and environmental emissions are problems that high capacity vehicles, HCT vehicles, can contribute to solving.


2019-02-14

VTI’s simulators are being used for emergency vehicles

Better accessibility and shorter response times for emergency vehicles – this is something that standardised, directed, traffic messages, transmitted over the 5G network can contribute. Within the EU project Nordic Way 2, a functioning prototype of such a...


2019-02-12

Modal shift - a way to achieve the environmental objectives

Shifting freight transports from road to rail and water can contribute to achieving the Swedish environmental and climate objectives by 2030. How this could be done is something that VTI researchers and researchers from Gothenburg University are investigating...


2018-11-19

Report regarding government commission on the costs of traffic to society has been submitted

Since 2013, the Swedish National Road and Transport Research Institute (VTI) has had several government commissions to produce documentation on the costs to society caused by traffic. On 1 November 2018, the agency reported its latest commission, Samkost 3....


2018-10-29

International standardisation efforts have many advantages

VTI participates in several international standardisation committees. The work is important because it helps to ensure that standards can be adapted to Swedish conditions and it also provides access to valuable contacts and networks.


2018-10-24

China wants to work with the best

Through the CTS cooperation, VTI is gaining valuable research contacts with China. The country is facing major challenges in the field of road safety but also has enormous potential.