Interrupted flow in Public Street could be finding at toll gate , cross road, market, school, and speed bumps. This research was carry out for study and proven inefectivity speed bumps be laidown in Toboko Street. There for inefectiveness can be seen in degrees services indicator (LOS = Level of Service) compared before and after speed bumps was set. Analytical relation among variable in street traffic. (i.e. speed vehicles, volume/street capacity) solution must be obtained to breaks the problem of inefficiency for future time.  In Ternate City region speed bumps usually be placed in local street/community areas. This phenomenom born in Toboko street, speed bumps who has set in that area absolutely disturb the comformity, accessibility, and borning sequence for the street usage. Outcome of the study declare that : site area before speed bumps be laid, and site area speed bumps be facilitated, (degree service) F, speed bumps facility don’t prevent a drivers to decreased speedity of their vehicles when its close in the area. Velocity free flow in non area facility Vfree = 29,424 km/H, meanwhile in the street by facility area Vfree = 5,147 km/H. Flow maximum in non area facility Fmax = 8,112 vehicles/H, in the facility area Fmax = 1,157 vehicles/H. Decreasing flow maximum occurred in the street by facility speed bumps. Irrasional planning on traffic engineering in Toboko street, by setting speed bumps, caused lowered degree service (LOS). Countinousing to set speed bumps facility in Toboko street, degree service will be LOS F (Level of Service False).