05.02 Highway 371/County Road 29 Intersection

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The sight restriction was measured by the time period(gap) between seeing an approaching vehicle and that vehicle entering the intersection. Drivers select an acceptable gap in which to cross the roadway. Research shows the 50th percentile gap selection(gap at which 50 percent of drivers will accept and enter the intersection) is 6.5 seconds and 85th percentile gap selection is 8.25 secondsl. Gap data was collected from TH 371 at CSAH 29/Wilderness Rd in four different locations (see Figure 4).The referenced locations in the figure correspond with the Gap Collection Locations shown in Table 1.The minimum observed gap(8.19 seconds) and smallest average observed gap(10.02 seconds)occurred for eastbound CSAH 29 looking to the north for southbound TH 371 vehicles(Location 1). Location 3,westbound Wilderness Rd looking to the south for northbound TH 371 vehicles,was the location of most concern which had a minimum observed gap of 9.60 seconds and an average observed gap of 11.18 seconds. Note that the gap at Location 3 was taken from the first sight of an approaching vehicle to the intersection.The pedestrian bridge did block the view of an approaching vehicle after it was initially detected for around 1-3 seconds. _-r a. � � � -�- �'� v a -- _�_ �� 1 � __ � ---_ E_ — ___�.��_ _—, , _ � _—.. �_ _____ 2 e�� eo5— , _�_ ____ __--ti. 4 --_- �, __� — _.�__ �_ .�,_.__ � _. . �—.._.—L.�. —.�.� 'w —._�. ...�...._�..�. .�_ .�..` �a:.,- *��,� ____ -�" 3 -R--_g1e'l��.,,,, _, , �� ,... �_--�._ � � _� �� -__ . �,, _ _ _ _ _ _ _ _ _ �`�,, �$ --,.._ a� � � `��.,�_ 3'NN[ 'j r �. PCIE upJM�ED SERM]CE L,w9Eh�T TYPE B ttara�: vvbl r t�7�C� CROr �[+�G PrniEP FEED f+�I�rr iace F61 I` RSC S ! 1�� +r2 FflUM SERY]CE CA911�T P`' TO 1�lI Pa f Yf11MT� �i�lr$�Qpp[p. � � Figure 4:Plan Sheet with Gap Collection Locations TH 371 at CSAH 29 Intersection Evaluation 6