There are annual reports published by the departments ofstatistics in almost all countries. They are open access documents and you caneasily obtain them from the internet. Alsso some national organisations publish reports either quarterly or annually. Economic report may also contain such information. Which countries are you interested in?

I'm interested in the country's "contrast" in its development. developed countries such as: Germany, USA, France, Italy, etc. Developing countries: Russia, Ukraine, Bulgaria, etc. countries with weak economies: Algeria, Egypt, South Africa, etc.

Maybe from police departments !

@ Mohamed, There are annual reports published by the departments of statistics in almost all countries. At the same time, you may look at Google and get some information about accidents by country.

WHO publication by region could also help in traffic fatality statistics

You would find the following report of interest: "Road Safety: Modelling a Global Phenomenon" - see the link attached.  Also the recent publication by Chen "Association between economic fluctuations and road mortality in OECD countries"

European Journal of Public Health, Vol. 24, No. 4, 612–614 - even though it's about OECD countries it will give you an idea about how to approach it

https://www.bitre.gov.au/publications/2014/files/report_141.pdf

You can get data from the World Road Statistics Database, but they charge a fee (not very expensive) to send their files.       

http://www.irfnet.ch/world_road_statistics.php

Thank you dear colleagues

You can find data for different countries at the Global status report on road safety 2013, by WHO. 

I grouped as much yearly information as I could find with 3 students working over a couple of years in the DRAG database. It is found (Report AJD-7 and AJD-7 EXCEL files) on the Safety page (bottom of page) of the Agora Jules Dupuit site (www.e-ajd.net). It would not be difficult to extend the database starting around 1965 with the more recent values and to add countries. I enclose a recent analysis of some of these data arguing that we do not really understang why one finds so many peaks in fatalities in or around 1972...Good luck..

Thank you very much for the detailed information

As you plan to build road accident models, I enclose the only survey of road accident models summarizing both aggregate and discrete model families and their histories. It was published as an editorial plus 3 pieces (4 in toto)  in Research in Transportation Economics (RETREC) in 2013. It is on the Safety page of the Agora Jules Dupuit site, but you could easily miss it...

Thank you for publishing, it will be very interesting to study.

I can reccomend You the IRTAD data base (I use it too).

Website:

www.irtad.net

http://www.worldlifeexpectancy.com/cause-of-death/road-traffic-accidents/by-country/

we all have got great information. Thank you for asking such an interesting question.