Perception of some seat belt reminder sounds

Sven Dahlstedt

A study was carried out to provide some background data on how acoustical seat belt reminder signals are perceived in a car. 19 subjects listened to 9 test sounds and one neutral reference sound while sitting in a stationary car and being exposed to a background noise corresponding to driving 50 km/h at top gear. Their task was to adjust the loudness level of each sound to make it “just audible”, “loud and clear” or “definitely annoying”. After the test session the subjects were also interviewed about which sounds they preferred or rejected.

The results indicate that the more complex sounds are set at fairly uniform levels, but that two of the tested sounds were set consistently lower for the

same perceived audibility. For one of these sounds the explanation to the deviation is assumed to be that the sound consisted of pure tones. For the

other sound, a “ticking” with rather brief pulses and an instantaneous onset, the very low dB(A) values are hypothesized to be an artefact of the

measurement mode.

The interview gave rather conflicting results concerning the “popularity” of the sounds. This finding is explained by the widely differing criteria used

by the subjects when preferring or rejecting a sound, which pinpoints the necessity of explicit specifications of the purpose of a seat belt reminder




International Conference on Electric Road Systems starts today

Electric Road Systems (ERS) is a relatively new concept with many initiatives on the way. To learn from each other and stimulate new collaborations the Swedish Research and Innovation Platform for Electric Roads arranged the first international conference...


Same survey of road users’ attitudes in 50 countries

At the Road Safety on Five Continents Conference, RS5C, one entire session presented a large survey of road users' attitudes in 38 countries. Results show large differences between countries in many areas, both regarding behavior and attitudes. A new survey...


Good results with alcohol interlock program according to Swedish study

An alcohol interlock program makes it possible for drink driving offenders to continue their everyday lives. In a Swedish study most of the participants were satisfied with the program and experienced improved health. They also reported drinking alcohol more...


Traffic safety in the spotlight

Today the Conference Road Safety on Five Continents (RS5C) opened in Jeju Island, South Korea. More than 220 participators have come from all over the world to present findings and learn about traffic safety. Dr. Young Tae Kim, Secretary-General of the...


VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...