Značky s informačnou funkciou: č. 301-599
Ministry of Transport and Construction of the Slovak Republic
2018-05
<a rel="nofollow" class="external text" href="https://web.archive.org/web/20180807202418/http://www.ssc.sk/files/documents/technicke-predpisy/pripomienkovanie/vl_6_1.pdf">http://www.ssc.sk/files/documents/technicke-predpisy/pripomienkovanie/vl_6_1.pdf</a> (internet archive)