Transportation letters

Year	# Articles
2021	1
2023	1

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	5	6	7	8	9	10

3 (2011)	1	?	?	?	?	?	?	?	?	?
5 (2013)	3	1	4	1	?	?	?	?	?	?
6 (2013)	1	?	?	?	?	?	?	?	?	?
6 (2014)	2	1	2	5	?	?	?	?	?	?
7 (2014)	?	?	3	?	?	?	?	?	?	?
7 (2015)	1	3	?	?	1	?	?	?	?	?
8 (2016)	?	?	1	?	?	?	?	?	?	?
9 (2017)	5	1	1	?	2	?	?	?	?	?
10 (2018)	2	5	2	?	4	1	?	?	?	?
11 (2019)	2	1	1	2	4	2	2	1	4	4
12 (2020)	4	4	4	2	3	4	2	1	1	3
13 (2021)	1	2	2	4	3	C	3	3	3	2
14 (2022)	4	5	1	5	2	5	3	3	4	7
15 (2023)	2	3	2	3	2	5	3	3	5	7
16 (2024)	4	6	5	?	?	?	?	?	?	?