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13-11 Traffic

Page 30: Table 6 – Is there sufficient Intersection sight distance in both directions? The table and text are unclear on this.

RESPONSE 13-11

 

As noted in Table 6, the required intersection sight distance (“ISD”) to the west for left turning traffic is 640 feet and to the east for right turning traffic is 725 feet, based on the 85th percentile speeds.  Based on our field measurements, there is over 1,000 feet of available sight distance to the east which exceeds the stopping sight distance (“SSD”) and ISD requirements.  To the west, we measured approximately 580 feet of available sight distance which exceeds the requirements for SSD but is 160 feet short of the requirements for ISD. 

 

Although it is desirable to meet both the SSD and ISD, meeting SSD is deemed acceptable by standard engineering practices since motorists approaching the site driveway have adequate time to react to a vehicle exiting the site driveway and safe conditions are maintained.

 

RESPONDENT:

 

Maureen Chlebek, McMahon Associates

 

DATE:

June 20, 2016