Three (3) type of highway maintanenance commonly conducted to enhance its serviceability and safety.ObjectivesEquipmentToolsEffectivenessessons earned ane !ontrol To unsure that the vehicles observe their lanes in order to avoid accidents" magnetic rails # etc"sensors on the vehicles" better lane observance" requires equipment on the vehicle side#which may ma$e it difficult to implement in some economies%oad !ondition &arning To warn the user about road condition such asicy roads and incidents " !!T' # inductive loops and others sensors variable message signs"information processing "reduce accidents # better tool for action"Theft of the equipment can be a major problem!ontrol !entre To observe and respond to various incidentsand events"various "various "better response "effective but requires coordination between parties.