Board Thread:Game Discussion/@comment-28505549-20170603175915/@comment-26829117-20170606164614

It's possible but it has a number of issues:
 * You want to make sure the device you use is clean (preferably a factory reset) otherwise you risk merging your profile with theirs
 * They will have to give you their facebook or google account details which is not advisable, even with an RR3 specific account
 * This is one of the things that FM really don't like and will ban anyone they catch doing it. Timezone jumping and two devices racing at the same time are a sure giveaway

Whilst you are free to do this, I wouldn't recommend it.