Which AASHTO guide and table specifies when a median barrier is required?

Which AASHTO guide and table specifies when a median barrier is required?

• A. AASHTO Roadside Design Guide, Table 5-4
• B. AASHTO Roadside Design Guide, Table 6-1
• C. AASHTO Traffic Control Devices Guide, Table 7-3
• D. AASHTO Geometric Design Guide, Table 10-2

Answer: (B)

The AASHTO Roadside Design Guide, specifically Table 6-1, outlines the criteria for determining when a median barrier is required on roadways. This guide emphasizes the safety considerations for roadside design, including the conditions under which barriers should be used to prevent vehicles from crossing the median, which is especially crucial for divided highways. Table 6-1 provides guidance about the necessary conditions for median barriers, taking into account factors such as median width, traffic volume, and speed. In essence, the requirements for installing a median barrier are essential for enhancing roadway safety and reducing the likelihood of crashes that can occur when vehicles enter opposing traffic lanes. Using this specific guide ensures that transportation engineers can make informed decisions regarding median design and barrier placement, thereby improving overall traffic safety. The other options pertain to different aspects of roadside design and traffic control, which do not specifically address the requirements for median barriers.

The AASHTO Roadside Design Guide, specifically Table 6-1, outlines the criteria for determining when a median barrier is required on roadways. This guide emphasizes the safety considerations for roadside design, including the conditions under which barriers should be used to prevent vehicles from crossing the median, which is especially crucial for divided highways.

Table 6-1 provides guidance about the necessary conditions for median barriers, taking into account factors such as median width, traffic volume, and speed. In essence, the requirements for installing a median barrier are essential for enhancing roadway safety and reducing the likelihood of crashes that can occur when vehicles enter opposing traffic lanes.

Using this specific guide ensures that transportation engineers can make informed decisions regarding median design and barrier placement, thereby improving overall traffic safety. The other options pertain to different aspects of roadside design and traffic control, which do not specifically address the requirements for median barriers.