Hi Ian, u are right. E se quando viaggio, prendo una macchina full stop is not correct in italian. At least it makes sense: Se e quando viaggio, prendo una macchina. (In a contest in which a person is telling someone he doesn’t like travelling and he never catchs planes. So he is stressing “If and when” Se e quando : If and when I’m going to travel, I’ll take a car). Instead it’s correct in this sentence: E, se quando viaggio prendo una macchina, mi sento male. (And if a take a car for travelling, I feel sick). Maybe he prefers travelling by train or by plane. Anyway, also in this case is better to say: Quando viaggio, se vado in auto mi sento male. Ciao

it isn't very fluent, but it is right, but you must put a comma in this way: "... e se, quando viaggio, prendo una macchina ...". It is more fluent to say: "... e se prendo una macchina quando viaggio ..." Ciao Yan.