Sisitemu ya feri yimodoka itangwa na Trans-Power ikorwa kandi ikageragezwa hubahirijwe ibipimo bya SAE: SAE J639: Sisitemu yo guhagarika ibinyabiziga, hamwe nibisabwa nabakiriya.Kugirango harebwe niba ubushobozi bwo gutwara, umutekano, umutekano, ubuzima bujyanye nibisabwa kugirango ibicuruzwa bikorwe, kugirango ubuziranenge bwiza n'umutekano byimodoka.
