Case studies on transport policy

Year	# Articles
2022	2

Articles in SafetyLit
Y-Axis = Volume :: X-Axis = Issue
?=unknown status :: X=no issue published :: nn=articles from issue :: A=relevant article(s) IDed to add
S=searched, nothing relevant :: O=issue published but not yet searched :: C=combination issue

		1	2	3	4

1 (2013)	?	1	C	?	?
2 (2014)	?	1	5	3	?
3 (2015)	?	2	3	1	5
4 (2016)	?	1	6	?	1
5 (2017)	?	?	11	1	8
6 (2018)	?	6	3	1	7
7 (2019)	?	4	10	1	5
8 (2020)	?	10	11	8	14
9 (2021)	?	7	17	12	14
10 (2022)	?	15	19	13	9
11 (2023)	8	?	?	?	?
12 (2023)	12	?	?	?	?
13 (2023)	19	?	?	?	?
14 (2023)	15	?	?	?	?