Trees in Hazardous Locations

Index of Strategies by Implementation Timeframe and Relative Cost

The table below (Exhibit IV-1) provides a classification of strategies according to the expected timeframe and relative cost for this emphasis area. In several cases, implementation time will depend on such factors as the agency's procedures, the length of roadway involved, the need for additional right-of-way, the number of stakeholders involved, and the presence of any controversial situations. The range of costs may also be somewhat variable for some of these strategies because of many of the same factors. Placement in the table below is meant to reflect costs relative to the other strategies listed for this emphasis area only. The estimated level of cost is for the commonly expected application of the strategy.

EXHIBIT IV-1
Classification of Strategies According to Expected Timeframe and Relative Cost

   

Relative Cost to Implement and Operate

Timeframe for Implementation

Strategy

Low

Moderate

Moderate to High

High

Short (less than) a year)

16.1 A1—Develop, Revise, and Implement Planting Guidelines to Prevent Placing Trees in Hazardous Locationsa (T)b

check      
 

16.1 A2—Mowing and Vegetation Control Guidelines (P)

check      
 

16.1 B4—Delineate Trees in Hazardous Locations (E)

check      
 

16.1 B1—Remove Trees in Hazardous Locationc (P)

   check    
 

16.1 B2—Shield Motorists from Striking Trees (P)

  check    

Medium (1­2 years)

16.1 B3—Modify Roadside Clear zone in the Vicinity of Trees (P)

    check  

Long (more than 2 years)

          

a Timeframe used for guidelines is for their development. Additional time will be required for their application in the field.

b For an explanation of (T), (E), and (P), see page V-2.

c The cost of removing a single tree is relatively minimal. Even in the more commonly expected case of a tree-removal program for a significant portion of highways, the costs are expected to be relatively moderate, compared to roadside modifications for a similar mileage of highways.

Strategy 16.1.0.1, Apply Strategies in the AASHTO Strategic Highway Safety Plan run-off-road guide, is not represented in the table above due to the various costs and implementation times. Please refer to the AASHTO Strategic Highway Safety Plan run-off-road guide for more details concerning these strategies.