Economy, pleasing appearance, and safety are factors to be considered in this determination. Optional median designs may be as shown on Figure 305.6. 307.5 Multilane All Paved Cross Sections with Special Median Widths A multilane cross section with a narrow median is illustrated in Figure 307.5 . This section is appropriate in special circumstances where a wider median would not be justified. It should not be considered as an alternative to sections with the median widths set forth under Index 305.1 .
Examples are steep mountainous terrain and unstable mountainous areas.
Where large excavation quantities or other factors generate unreasonable costs, 1.2 m shoulders may be considered. Where the roadbed width does not contain 2.4 m shoulders, emergency parking areas clear of the traveled way should be provided by using daylighted cuts and other widened areas which develop during construction. RRR projects on freeways, expressways, and multilane conventional highways are generally required to meet new construction standards.