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LOCAL ROAD SAFETY PLAN

Project Decision Tree Example

View the full Palm Beach County Local Road Safety Plan
Project Decision Tree Example 

PALM BEACH COUNTY LOCAL ROAD SAFETY 

PLAN DEVELOPMENT 

Rural Segment 

Palm Beach County Route 717 (Muck City Road) 

Observed Severe Injury Hotspot 
 

Site Overview 

Aerial View of CR-717 with 

three fatal crashes located. 

Image Courtesy of Google 

Earth, accessed 10/29/2018 

Project Decision Tree Example 

Rural Segment 

Route 717 (Muck City Road) 
 

 

 

 

 

Site Overview 

3 Fatal Crashes (2011-2014)

 All single vehicle, roadway departure

 No other severe crashes along corridor

No grade or curvature present

AADT 3,172 (Palm Beach County, 2016)

Site is 2 lanes with no shoulders

Approximately 5.6 miles long

Project Decision Tree Example 

Rural Segment 

Route 717 (Muck City Road) 
 

 

 

 

 

 

 

 

 

 

 

-

Rural Segment Decision Tree 

Clear Zone, Roadside 

Hardware, Roadside 

Design Improvements YES 

Enhanced 

6” or 8” 

Edgelines 

NO 

NO 

Thermoplastic Edgeline 

AND Shoulder 

Treatments; 

+ Thermoplastic

Centerline Markings 

YES 

NO 

Pave 2 ft + Edge/Shoulder 

Rumbles AND/OR Shoulder 

Treatments; 

+ Centerline Rumbles

Edge/ Shoulder 

Rumbles 

AND Shoulder 

Treatments; 

+ Centerline Rumbles

YES 

Clear Zone or 

Roadside 

Hazards? 

Paved 

Shoulder? 

Traffic 

Volume 

<1,000 vpd 

>15,000 vpd 1,000 - 15,000 vpd 

Noise 

Sensitive? 

NO 

Multilane Divided; 

Edge/Shoulder 

Rumbles; 

AND/OR Shoulder 

Treatments 

YES 

History of 

Severe 

Head On 

Crashes? 

Chevrons/Delineation; 

Advanced Warning and 

Speed Advisory; 

Lighting 

History of 

Severe Crashes 

Along Curves? 

Pavement Texturing 

(Grooving/Tining, 

Overlay/High Friction 

Surface Treatment) 

NO 

YES – Includes Wet 

Weather Crashes 

YES – Does Not Include 

Wet Weather Crashes 

Project Decision Tree Example 

Rural Segment 

Route 717 (Muck City Road) 
 

 

 

Step 1 – Clear Zone/ Roadside Hazards 

 Shoulders have gentle

slope

 Fixed objects, like

telephone poles, are set

back from the roadway

~25’

 No barriers or equipment

in clear zone

 Clear zone, roadside 

hardware, and roadside 

design improvements 

are NOT recommended 

at this site

Typical view of CR-717. Image 

Courtesy of Google Street View, Project Decision Tree Example 

accessed 10/29/2018 Rural Segment 

Route 717 (Muck City Road) 
 

 

 

 

 

Chevrons/Delineation;

Advanced Warning

and Speed Advisory;

Lighting

Step 2 – Severe Crashes Along Curves 

 There are no curves

along the route.

Therefore, there are no

severe crashes along

curves.

 Pavement texturing, 

chevrons/delineations, 

advanced warning and 

speed advisory signs, 

and lighting are NOT 

recommended for this 

site.

Project Decision Tree Example 

Rural Segment 

Route 717 (Muck City Road) 
 

 

 

 

Steps 3 and 4 – Traffic and Noise 

Considerations 

Aerial View of residences along CR-717 

at State Market Road. Image Courtesy 

of Google Earth, accessed 10/29/2018 

 Most recent traffic volume for the

section was approx. 3,100 vpd-the 

middle path will be followed.

 The western end of the corridor is 

close to residential properties

which may be sensitive to noise.

Otherwise, noise is not an issue.

 Recommend NOT pursuing 

noise-sensitive applications. The 

majority of the corridor is not a 

noise-sensitive location and 

installing pavement markings 

that vary along the corridor 

could cause confusion.

 Also, there is currently no 

shoulder to improve, which is 

addressed further down the 

“NO” branch.

Project Decision Tree Example 

Rural Segment 

Route 717 (Muck City Road) 
 

 

 

 

 

Steps 5 – Shoulder Presence 

 There is no shoulder along the

corridor.

 Recommend to install paved 2-

foot shoulder with edge/

shoulder rumble strips.

 Recommend to install 

centerline rumble strips

• Requires repainting of 

centerline to acceptable 

standards

Typical view of CR-717. Image 

Courtesy of Google Street View, Project Decision Tree Example accessed 10/29/2018 

Rural Segment 

Route 717 (Muck City Road) 
 

 

 

 

 

 

Final Recommendations 

The final recommendation is the installation of a 2-foot

paved shoulder on both sides of the roadway with shoulder

and centerline rumble strips.

Approximate project cost = $330,400

 Shoulder rumble strips $6,000 per mile x 5.6 miles = $33,600

 Centerline rumble strips (with restriping) $4,000 per mile x 5.6 miles =

$22,400

 2 foot paved shoulder (both sides) $49,000 per mile x 5.6 miles=

$274,400

Project Decision Tree Example 

Rural Segment 

Route 717 (Muck City Road)