Traffic causes negative elements to urban environment and accidents is one of them. It is not very often we see accidents happen, so it might seem that neighborhoods we live in or visit are quite okay in this sense.
I started looking the situation in whole Helsinki area. First map shows that there has happened over 100 accidents in Haaga area in year 2016. Map shows that Haaga and its neigborhoods are the worst place in Helsinki. The statistics take into account all accidents where someone has injured or dead and that has been informed to police. This map can be found in Helsinki map service. In the second map I looked more carefully which age groups and what kind of traffic user has had accidents. It shows that in Haaga area there has been 5 accidents where person over 65 years as a driver has had a serious accident.
More accurate data can be found in Helsinki Region Infoshare. It is in text format (CSV), but has spatial information and can be used in QGIS. Next map shows all accidents, also those with only material loss, in Haaga area during 2000-2016. Year 2016 is marked in green in first map.
Last map shows accidents with material loss with smaller lilac dots, someone injured is yellow and deaths are marked with red dots.
Traffic accidents happen for many reasons and are not obviously bound to a place. But if there are very dense bad spots, it is worth to have a close look and find out if there is something in the environment to improve.