Upvote:2
No, not safe if you are comparing that to western standards. I live in Jakarta half of the year for many years now and I never tried ojek because I do not think it is safe, but that's due to personal issues with motorcycles.
Anyway, inside cities motorcycles will not have a chance to go really fast, and in my years here I have never seen a serious ojek accident inside cities to be honest. So you can use ojek as long as it is inside cities and condensed areas as it is the fastest transportation method.