15.705 Lane Code <br />15.705 <br />Roads where any 500 foot segment exceeds 8% in grade shall be considered <br />Mountainous. <br />(5) Surface Type. Surface type shall be pavement. <br />(6) Pavement Structure. Pavement Structure design shall meet the <br />requirements specified in LC 15.707. <br />(7) Vehicle Travel Lane Width. Travel lane striping is not required on Rural <br />Local Roads. Rural Local Roads are usually unstriped, shared roadways with low design <br />speeds and traffic volumes. Roadways that are at least 20 feet wide may be striped with a <br />centerline. Roads that are at least 22 feet wide may be striped with a centerline and fog <br />lines. <br />(8) Shoulders. Road shoulders are not required. <br />(9) Roadway and Ditch Side-slopes. <br />(a) In general, ditch rock slopes and foreslopes no steeper than 4H:1 V <br />are required. <br />(b) When existing terrain precludes use of 4H:1 V side-slopes, steeper <br />slopes may be constructed if approved by the County Engineer or designee. <br />(c) When slopes steeper than 3H:1 V must be used, consideration will be <br />given to the use of a roadside barrier. The standards from the Oregon Highway Design <br />Manual publication cited in LM 15.450 shall be used when it is necessary to review the <br />efficacy of a barrier. <br />(d) The slope rate for cut slopes shall be determined by geotechnical <br />analysis and/or clear zone considerations. <br />(e) Side-slopes should be designed to ensure the stability of the roadway <br />and to provide a reasonable opportunity for recovery of an out-of-control vehicle. <br />(10) Ditch Depth. Ditch depth shall be a minimum of one foot below the <br />elevation of the roadway subgrade, as measured at the edge of the paved surface. <br />(11) Clear Zone. A minimum 10 feet wide clear zone is required from the edge <br />of the travel lane. The clear zone should be cleared of all unyielding objects such as <br />trees, sign supports, utility poles, light poles, and any other fixed objects that might <br />severely damage an out-of-control vehicle. The County Engineer or designee may waive <br />this requirement where there is guardrail protection. <br />(12) Pedestrian Facilities. Sidewalks or walkways are permissible and may be <br />required pursuant to adopted Transportation System Plan Bicycle and Pedestrian policies. <br />Walkways may be provided behind the ditch in the road right-of-way, but only at private <br />expense. Any proposed pedestrian facilities are subject to approval by the County <br />Engineer or designee. <br />(13) Bike Lanes. Due to the lower-volume, lower-speed character of Rural <br />Local roads, striped bicycle lanes are not required. Rural Local Roads shall be shared <br />travel-ways for bicycle and vehicular movement. <br />(14) On-Street Parking. On-street parking is not allowed. <br />(15) Maximum Grade. <br />(a) Maximum grade shall be 16%. A maximum grade of 20% is <br />allowable for spans of up to 100 feet on a straight tangent when topographic conditions <br />make lesser grades impractical. <br />(b) Grades that exceed 16% shall be paved. <br />(c) Road grades in excess of 8% require the following: <br />(1) Submit a center line profile prepared for the proposed road by <br />an Oregon-certified civil engineer or Oregon licensed surveyor. <br />(ii) The roadway shall be designed by an Oregon-certified civil <br />engineer. <br />15-50 LC15 <br />