7.2.2 Typical Section

Rural arterial example typical sections are shown in
Figure 7-1
through
Figure 7-6
below. The geometric dimensions shown in these sections may be adjusted in accordance with
Section 7.1
.
Selection of the appropriate cross-section is important for optimal safety and operational performance.
Table 7-2
provides guidelines on selecting optimized cross-sections for rural highways that are not divided with a median barrier. For additional guidance on roadway cross-section optimization, see
Section 7.2.5
.
Table 7-2: Potential Guidelines for Selecting Rural Cross Sections
AADT
Driveway Activity Index
1
 per Mile
Truck Percentage
Preferred Cross-Section
≤ 3,000
Any
Any
Two-Lane Undivided / Two Lanes with TWLTL
3,000 – 15,000
≤ 30
Any
Super 2
> 30
≤ 15%
Super 2 with TWLTL
16% - 25%
Super 2 with TWLTL
> 25%
Four Lanes with TWLTL
15,000 – 20,000
≤ 30
≤ 15%
Four Lanes with 4-ft Median Buffer
2
16% - 25%
Four Lanes with 4-ft Median Buffer
2
> 25%
Four Lanes with TWLTL
> 30
≤ 15%
Four Lanes with 4-ft Median Buffer
2
16% - 25%
Four Lanes with TWLTL
> 25%
Four Lanes with TWLTL
≥ 20,000
Any
Any
Four Lanes with TWLTL / Four-Lane Divided
Notes:
  1. Driveway activity index is the number of residential driveways. The index is equal to three times the number of industrial driveways, or 12 times the number of commercial driveways (measured per mile).
  2. 6-ft minimum shoulder width. Greater shoulder widths are desirable.
Rural Typical Section – 2 Lane ( click in image to see full-size image)
Figure 7-1: Rural Typical Section – 2 Lane
Rural Typical Section – 2 Lanes with SUP ( click in image to see full-size image)
Figure 7-2: Rural Typical Section – 2 Lanes with SUP
Rural Typical Section – Multilane Undivided with Median Buffer ( click in image to see full-size image)
Figure 7-3: Rural Typical Section – Multilane Undivided with Median Buffer
Rural Typical Section– Multilane Divided (4 Lanes) ( click in image to see full-size image)
Figure 7-4: Rural Typical Section– Multilane Divided (4 Lanes)
Rural Typical Section – Multilane Divided (6 or More Lanes) ( click in image to see full-size image)
Figure 7-5: Rural Typical Section – Multilane Divided (6 or More Lanes)
Rural Typical Section – Multilane Undivided with TWLTL ( click in image to see full-size image)
Figure 7-6: Rural Typical Section – Multilane Undivided with TWLTL