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H. CLEAR ZONE (distance from bikeway to traveled way) For on-road bikeways refer to the bikeway design (ROAos wlTHouT cuaes) tables to a es: the road suitability for bicycle travel. 8' 2C' MIN TRAVELED The tables will also enable "pretesting"of shoulder widen- Rte' ""'N W A Y ing and surfacng. Bike traffic must flow the same direction Z•MIN, as adjacent motor vehicle traf5c. Two-way bike traffic on 2'MIN, one-side of the road is not permitted. --� PAVED BIKEWAY For off-road bikeways, there are two categories: roads without curbs and roads with curbs. The proper set back from the traveled way is an important consideration for the designer because operation of the facility is de- (ROADS WITH CURBS(• pendent upon adequate separation from each respective travel mode (motor vehicle, bike, STREET pedes=ian) and star MIN. donary objers(poles, signs,.,).See Figure G. 4., MIN, dill I. DRAaTAGE For bike routes and lanes the exsrag roadway drain- PAVED.BIKEWAY age is normally adequate. However, on curb and gurter .PROVIDES ROOM FOR SIGNS,POLES, ETC. sections a check of ponding dept=should be made and corrective anion proposed if depths are significant. This may entail improved grate designs or wider bike lanes. FIGURE G On off-road bikeways, the surface of the bikeway 114 should have a cross-dope of two percent for the proper drainage. SIoping in one direction usually simplifies longi- tudinal drainage design and surface construe on, and accordingly, is the preferred practice. Ordinarily, surface drainage from the path will be adequately dissipated as it flows down gently sloping terrain. However, when the bikeway is corstn:cted on the side of a hill, a drainage ditch of suitable dimensions may be necessary on the uphill side to intercept the ll'de drainage. See Figure H. Cul- verts or bridges are necessary where a bikeway crosses a drainage channel- Siring of the required waterway opening 2 should be determined by a hydraulics engineer. Minimus culvert size used for bikeway drainage should be 18 inch diameter. Bikeway DraMage inlet grates m bikaways shall have openings narrow enough and short enough to =cure bicycle tires will not drop into the grates regardless of the direction of bicycle travel. Where it is not immediately feasible to re- place exirnng gates with standard grates designed for 2_% bicycles, 1 inch x 1/4 inch steel cross strap: should be welded to the grates at a spacng of 6 inches to 8 inches Variable on center, to reduce the sir.. of the opening,See Standard Plates 4151 and 4152 for acceptable designs of grates. Bikeway FIGURE H • 128