The Potential of Key Driver Assistance Systems to Improve Road Safety and Automated Driving Systems to Improve Pedestrian and Cyclist Safety

Tutkimustuotos: VäitöskirjaCollection of Articles


Safer road traffic is one of the key impacts advanced driver assistance systems (ADASs) and highly automated vehicles (HAVs) are predicted to deliver, but the potential safety impacts vary between different systems and are influenced by many factors. This thesis aims to evaluate the potential for preventing fatal road crashes in Finland by introducing passenger cars equipped with key ADASs or automated driving systems. In this thesis, key ADASs are lane keeping assistance (LKA), automatic emergency braking (AEB) and adaptive cruise control (ACC) systems. The potential of HAVs in terms of preventing crashes is assessed in pedestrian-car and cyclist-car crashes.

Four retrospective cross-sectional studies of fatal crashes were made to evaluate the potential of key ADASs and HAVs to prevent crashes in which a passenger car was involved in Finland in 2014–2016. Each case (n=479) that would theoretically be applicable to a certain ADAS was analysed individually using a qualitative, casebycase study to identify those cases that could have been prevented by key ADASs. Using a similar method, the potential of HAVs in preventing pedestrian and cyclist crashes (n=64) were also assessed.

The results indicate that 29% of fatal passenger car crashes could potentially have been avoided by the combination of LKA, AEB, and ACC systems. HAVs could potentially have prevented 70–93% of fatal crashes between pedestrians and passenger cars. The range depends on whether pedestrian safety (93%) or efficient traffic flow (70%) is prioritised in HAV operation. Pedestrian-car and cyclist-car crashes could be most effectively reduced by HAVs when they are able to reliably assess the intentions of other road users.

The findings of the thesis show that the introduction of cars equipped with key ADASs or automated driving systems – as a replacement for cars controlled entirely by the driver – is an important action to promote road safety. Although many factors can reduce the potential safety impacts, such as low market penetration rates and driver behaviour, the impacts can also be increased by advancements in vehicle and infrastructure requirements. Prioritising safety over other ambitions in the road transport system would enable the safer operation of HAVs, especially in the initial stage of the introduction, but it would also support safer behaviour of drivers.
KustantajaTampere University
ISBN (elektroninen)978-952-03-1926-7
ISBN (painettu)978-952-03-1925-0
TilaJulkaistu - 2021
OKM-julkaisutyyppiG5 Artikkeliväitöskirja


NimiTampere University Dissertations - Tampereen yliopiston väitöskirjat
ISSN (painettu)2489-9860
ISSN (elektroninen)2490-0028


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