Agenda - Council - 06/13/2017 - Laserfiche WebLink

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The daily total traffic entering and exiting the site accesses based on the collected turning movement counts, surrounding development trip generations, and the site trip generation were estimated as follows: i. Southern site access at Bunker Lake Boulevard — 970 Vehicles per day ii. Center site access onto Puma Street — 920 Vehicles per day iii. Northern site access onto Puma Street — 680 Vehicles per day iv. Site access onto Alpine Drive — 350 Vehicles per day Main Line ADTs are roughly: i. Puma Street — 4,400 Vehicles per day ii. Alpine Drive — 2,700 Vehicles per day Based on these estimated volumes and the criteria published in Warrant 9 (Vehicular Volume Warrant) from the MnDOT Access Management Manual's Turn -Lane Warrants for Undivided Highways, Table 5, below, was created. This table shows the estimated mainline and access volumes and the corresponding MnDOT Warrant thresholds. Table 5 — New Trip Generation Intersection e urn ane Street ADT Access ADT ig urn ane Street ADT Access ADT Southern site access at Bunker Lake Boulevard Center site access onto Puma Street Northern site access onto Puma Street Site access onto Alpine Drive Criteria 4,400 4,400 4,400 2,700 4,000 — 4,999 970 920 680 350 > 1,000 -or- -or- 1,500 — 2,999 > 1,500 4,400 4,400 4,400 2,700 970 920 680 350 > 1,500 > 100 As Table 5 shows, left -turn lanes are not warranted based on the estimated 2040 Build volumes while the right -turn lane warrant is satisfied. Again, these values are based upon a 45 MPH speed limit, which is not present on either Alpine Drive or Puma Street. If the speed along these streets are raised to 45 MPH or higher the Turn -Lane Warrants should be re -assessed. However, under the existing circumstances, safety is not a concern due to the following factors: i. All site accesses are connected to low speed 30 MPH roadways. ii. Sufficient sight distance is provided at all site accesses. iii. Delays for all turning movements into developments remain at LOS B or better. iv. All queues remain below two vehicles for any turning movement into the development. The sight distance/sight line analysis was completed at each intersection in April 2017. The Capstone Homes accesses along Puma Street provide significant sight distance with the intersections of Puma Street/Alpine Drive and Puma Street/Bunker Lake Boulevard being visible from each site access. The site Traffic Impact Study 10 Capstone Homes Residential Development NSULTING