Rubuta ci gaba don wannan sakin layi - Yawan masu baje kolin ya karu a nuni na biyu da na uku, waɗanda aka gudanar a 1939 da 1940. Duk da barkewar Yaƙin Duniya na II, masu baje kolin sun fito ne daga Jamus, Italiya, Amurka, Protectorate na Bohemia da Moravia. Musamman shahararrun motoci ne da ke da injunan gas na katako. An soke wasan kwaikwayon na huɗu, wanda aka tsara don Mayu 1941, bayan mamayewar Jamus na Yugoslavia, wanda ya haɗa da mummunar fashewar Belgrade
, ya fara ne a ranar 6 ga Afrilu 1941.