Iftiiminta sare ee jaranjarada guud ahaan waxaa lagu rakibay qaybta sare ee gadaasha gaariga, si gaariga loo wado uu fududahay in la ogaado safka gaariga, si looga hortago shilka dambe ee gawaarida. Sababta oo ah celceliska gaariga ayaa horey u lahaa laba nalal oo biriiga ah oo lagu rakibay dhamaadka dambe ee gaariga, hal bidix iyo mid midig.

Marka nalka sare ee jaranjarada ayaa sidoo kale loo yaqaannaa iftiinka saddexaad ee fariiraha, nalka jaranjarada sare, iftiinka saddexaad ee fariimaha saddexaad. Iftiinka sare ee jaranjarada waxaa loo isticmaalaa in lagu digo gaariga gadaashiisa, si looga fogaado isku dhaca gadaal-gadaal.

Gawaarida aan lahayn nalalka jaranjarada sare, gaar ahaan baabuurta iyo gawaarida mini ee jaranjarada ah markii ay u jeedsan yihiin iftiinka gawaarida dambe, gaar ahaan darawalka gawaarida gawaarida, basaska iyo basaska leh chassis sareeya mararka qaarkood way adagtahay in si cad loo arko. Sidaa darteed, qatarta qarsoon ee shilka gadaal-u-soo-noqoshada waa mid aad u ballaaran. [1]

Natiijooyin tiro badan oo cilmi baaris ah ayaa muujinaya in nalka sare ee jaranjarada uu si wax ku ool ah uga hortagi karo oo yareyn kara dhacdada shilka dambe ee dambe. Sidaa darteed, nalalka jaranjarada sare ayaa si balaadhan loogu isticmaalaa dalal badan oo horumarsan. Tusaale ahaan, dalka Mareykanka, sida ku xusan xeerarka, dhammaan gawaarida cusub ee la iibiyay waa in lagu qalabeeyaa nalalka jaranjarada sare laga soo bilaabo 1986 gawaarida gawaarida iftiinka ah ee la iibiyay