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)

10 Mile spacing

1 Mile spacing

Two Lane Highway

Signalized Arterial

Proposed Facility Types

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.

End of Problem 1