I recommend Duoderm or a similar dressing to anyone with road rash.

It is expensive and it is gross, but it really works and it helps cut down on the pain too because it protects well. You may however have trouble finding sheets large enough for patches as large as yours....

It is nasty - you put it on and leave it on until it falls off. It turns kind of whitish from its yellow/clear unused appearance and gets a bit puffy. (it is *not* puss - it is the dressing absorbing and holding moisture) It usually stays on for 3-7 days depending on how often you shower and how dry you can keep it when you do.

It heals up road rash about twice as fast as spots that are allowed to scab up.