英语翻译Ideal conditions for uninterrupted flow facilities include the following:lane widths of 12ft ;clearance of 6ft between the edge of the travel lanes and the nearest obstructions or objects at the roadside and in the median ; design speed o

英语翻译Ideal conditions for uninterrupted flow facilities include the following:lane widths of 12ft ;clearance of 6ft between the edge of the travel lanes and the nearest obstructions or objects at the roadside and in the median ; design speed o
英语翻译
Ideal conditions for uninterrupted flow facilities include the following:lane widths of 12ft ;clearance of 6ft between the edge of the travel lanes and the nearest obstructions or objects at the roadside and in the median ; design speed of 70mph for multilane highways ,60mph for two –lane highways ;only passenger cars in the traffic stream ; level terrain.
Ideal conditions for intersection approaches include the following :lane widths 12ft ;level grade ;no curb parking on the intersection approaches ;only passenger cars in the traffic stream and no local transit buses stopping in the travel lanes ;all vehicles traveling straight through the intersection; intersection located in a non –central business district area ;no pedestrians; at signalized intersection approaches ,green signal available at all times .
In most capacity analyses ,prevailing conditions are not ideal ,and computations of capacity ,service flow rate ,or level of service must include predictive adjustments to reflect this absence of ideal conditions .prevailing conditions are generally conditions that change in the long term.
Roadway conditions
Roadway factors include geometric conditions and design elements .in some cases ,these factors influence the capacity of a road ,whereas in others ,the factors may affect a measure of effectiveness ,such as speed ,while not affecting the capacity or maximum flow rate that can be carried by the facility.
Roadway factors include the following:
1.the type of facility and its development .
2.lane widths
3.shoulder widths and lateral clearances.
4.design speed.
5.horizontal and vertical alignments.
6.availability of queuing space at intersections.

英语翻译Ideal conditions for uninterrupted flow facilities include the following:lane widths of 12ft ;clearance of 6ft between the edge of the travel lanes and the nearest obstructions or objects at the roadside and in the median ; design speed o
理想条件畅通无阻设施包括:呎宽里; 清除6ft之间的优势和旅游专线就近在路边障碍物或物体和位数; multilane高速公路设计速度为70mph,60mph为双线公路; 仅轿车在车流; 地形水平.理想条件交叉方式如下:呎宽里; 职等; 在路口停车没有办法制止; 只有在车流和轿车过境巴士停在任何地方旅游线; 所有车辆通过路口直接往来; 设在路口的非中央商务区面积; 无行人; 在路口灯号的方式,可在任何时候绿灯.大多数分析能力,普遍不理想的情况,计算能力、服务流率,要把服务水平和调整,以反映此预测没有理想的条件.一般现况条件的长期变化.道路几何条件和环境因素,包括道路设计元素.在某些情况下,这些因素影响了道路的能力,但在其他因素的可能影响的效果,如速度,同时不影响总容量最大流量可携带的设备.公路的因素包括:1.设施的类型及其发展.2.里宽3.承担横向宽度和通行.4.设计行车速度.5.横向和纵向的路线.6.有位排队路口.