Real World Effects of Advan­ced Dri­ver Assi­stance Sys­tems

Earlier retrospective accident studies carried out by UDV already predicted benefits for ADAS like AEB and lane support systems (LSS: lane change assist systems LCA and lane-keeping assist systems LKA).

The mix of systems in the vehicle fleet and the available accident data now make it possible to compare accident patterns for passenger cars with and without AEB, LSS and LCA.

The UDV has used its accident database (UDB) in order to perform a comprehensive analytical accident study on the benefits of these systems. In the process, scenarios were also identified in which the current systems are ineffective or insufficiently effective.

Methodology

The study identifies relevant accident scenarios and describes shifts in the accident patterns for cars either equipped or not equipped with these systems. Based on a case-by-case analysis, it gives possible explanations for the occurrence of such accidents. 

The positive shifts in accident patterns show that AEB systems are effective in the following situations:

• typical linear rear-end collisions, and in particular 
• rear-end collisions with vehicles waiting or braking at junctions as well as collisions with 
  the rearmost vehicle in a traffic jam.
• reduction in accident severity due to more frequent and more effective braking compared to cars without AEB.

In the following situations, AEB systems show no effect or an insufficient effect:

• high driving speeds and on motorways
• detection of and response to hazards in curved roads
• collisions with two-wheel motor vehicles, collisions with oncoming 
  traffic and accidents involving vehicles turning into or crossing the carriageway.

The positive shifts in accident patterns show that LCA-systems are effective in the following situations:

• turning-off accidents
• in accidents on roads outside of built-up areas
• serious and fatal accidents outside of built-up areas.
   

In the following situations, LCA- systems show no effect or an insufficient effect:

•  accidents on motorways 
• complex accidents with multiple lane change maneuvers.
   

The positive shifts in accident patterns show that LSS systems are effective in the following situations that were caused by unintentional lane departure:

• single vehicle accidents and accidents with oncoming traffic 
• accidents on roads outside of built-up areas and on motorways
• serious and fatal accidents in general.
   

In the following situations, LSS- systems show no effect or an insufficient effect:

• accidents in urban areas
• accidents at speeds below 60 kph
• accidents with impaired drivers (especially impairment due to sudden sickness).