Traffic freeze is the most expensive but comes in handy on the final lanes, where multipliers are highest (even over x12).
http://52she.top/forum.php?mod=viewthread&tid=194091&extra=
https://wietmarkt.nl/viewtopic.php?t=593852
http://eporady.starostwo.ketrzyn.pl/viewtopic.php?f=5&t=60763
http://foro.murenacidos.com/showthread.php?tid=17786
http://horsecity.ru/phpBB3/viewtopic.php?f=14&t=217568
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=580078
https://ufr-2020.front5.picapo.net/forums/viewtopic.php?pid=594967
https://planeswalkers.org/viewtopic.php?t=70997
http://labradory.info.pl/viewtopic.php?f=9&t=30589
https://www.ww2.site/forum/viewtopic.php?t=365925
https://www.ww2.site/forum/viewtopic.php?t=121305
http://oldsite.giessen46ers.de/fantalk/viewtopic.php?f=9&t=253575
http://eporady.starostwo.ketrzyn.pl/viewtopic.php?f=3&t=64356
https://ufr-2020.front5.picapo.net/forums/viewtopic.php?pid=450898
http://www.horsecity.ru/phpBB3/viewtopic.php?f=5&t=247824
http://opendemjapan.parallel.jp/phpBB3/viewtopic.php?t=120239