Problem 1: Determination of Facility Types for Analysis
Key Issues
Why are we analyzing Krome Avenue? What is the regional significance of Krome
Avenue? What is the regional significance of roadways
intersecting Krome Avenue? Based on the map of the area where do you
think traffic that is using Krome Avenue is going to/coming from?
Sub-problems:
Sub-problem 1a: At what point does Krome Avenue change from a two-lane highway to a signalized arterial?
Sub-problem 1b: What Class should be assigned to each of the facilities that are identified? Sub-problem 1c: What, if any, conditions exist at the controlled intersections that could impact the analyses?
Sub-problem 1a: At what point does Krome Avenue change from a two-lane highway to a signalized arterial?
Two-lane highway
Signalized arterial
Primary criterion for distinguishing an urban street vs. a two-lane highway? Signalized intersection spacing:
> 2 miles: Probably a two-lane highway (Use Chapter 20)
2 miles: Probably an urban street (Use Chapter 15)
What additional information might be needed
Land use and zoning along the corridor (potential for development and type)
Transportation (potential intersection or parallel roadways)
Supporting policies of the local jurisdiction (air quality, VMT reduction techniques that may affect the assumptions)
Sub-problem 1b: Determining the Facility Class and Scope of the Analysis
Two-lane Highways
Class I Class II
Urban Arterials
Class I Class II Class III Class IV
Why is there a further distinction within facility types?
Because drivers have different expectations for speed, delay etc. on different classes of two-lane highways and urban arterials.
What parameters contribute to the distinction?
Urban Streets roadside developmentpedestrian activity posted speeds cross sectionsignal spacing
Two-lane highwaysLength of tripType of trip
Are the segments under consideration homogenous throughout?
There are no observations in the field that would indicate otherwise.
Arterial Class
HCM Depiction of Class I Typical View of this section of Krome Ave
Access Density: Very Low
Pedestrian Activity: Very little
Both conditions suggest Class I
Two Lane Highway Class
Class I: Expectation of high speedClass II: High Speed is not essential
Lower speed limit Scenic route, etc.
North Section: Posted speed 50 mph
Definitely Class I
South Section: Posted speed 45 mph
•This section could go either way
•If Class I is assigned, LOS will be very low because of the posted speed.
Summary of Krome Avenue Facility Types for Analysis
Section BoundariesFacility Type Class
NorthOkeechobee to Kendall
Two-lane highway I
Center Kendall to
EurekaTwo-lane highway I, II
South Eureka to Avocado
Signalized Arterial I
Sub-problem 1c: Special Considerations for the Analysis
Need to identify conditions that
Could affect the outcome of the analysis beyond the scope of the procedures
Would require some modification of the procedures to achieve valid results.
Examples of Special Considerations
Significant queues occurring on a two-lane highway
Backup from one intersection into another intersection
Overflow of a storage bay Short sections of a longer facility that have a
different cross section than the main facility. Control features that are not covered by the
HCM procedures Conditions that would suggest the use of traffic
models that are more complex than the HCM
Special Conditions
A short piece of four-lane divided roadway on Krome Avenue immediately south of Okeechobee.
Excessive queuing on the northbound approach to Okeechobee during the PM peak.
Special Conditions (continued)
Geometric improvements to eliminate congestion during the peak period Okeechobee Road Kendall Biscayne.
There are no conditions observed that would suggest the need to use traffic models that are more complex than the HCM.