achd traffic impact fee methodology exhibit b august 23 2006 page 1 introduction the ada county highway district has prepared a tif to meet requirements of idaho act which states that an ordinance must provide detailed description by costs per service unit are determined code section 67 8204 16 sets out such and formula this provides additional explanation calculates maximum fees may be charged in areas accordance with was developed consideration capital improvements plan cip as further described c based on analysis future transportation system deficiencies employing compass regional travel demand model consistently summarize identify where volumes exceed capacity s roadway also used estimate average conditions generated new development within including land use assumptions trip generation vehicle