concerning ITS for motorcycles, the PISa project (www.pisa-project.eu) proposed a prioritisation of safety functionalities to be integrated on powered two wheelers, based on estimated influence in real-world motorcycle crashes.
Attached is a link to related Executive Summary.
This activity was briefly presented at some conferences (see attached), but with poor details. And as far as I know there is not a journal paper on that.
The book "Human Factors in Traffic Safety, 2nd Edition" written by Robert Dewar and Paul Olson deals with the aspect of ITS on Safety in Part IV (published by Lawyers & Judges Publishing Company, Inc). See if you can get the information you are looking for.
Hi Jacek, RITA provides a good resource for ITS vs. Safety: http://www.itsbenefits.its.dot.gov/its/benecost.nsf/SingleTax?OpenForm&Query=Crash%20Prevention%20&%20Safety ; Other than safey, RITA also summarizes ITS benefits on other aspects in transportation.Hope it will be useful for you.
Have a look at the results of the EU research project "EURO FOT": http://www.eurofot-ip.eu/ There should be a lot of information of the outcomes publicly available.