47th DR NE and 121st PL NE (45th Ave NE to 12000 47th DR NE)

The City of Marysville had been informed of traffic safety concerns within the neighborhood.  Based upon these concerns, the Public Works Department through the Neighborhood Traffic Safety (NTS) program evaluated each concern including performance of traffic counts upon several neighborhood streets.  The traffic counts are summarized below:

Severity Score 6.5

List of traffic studies in the NTS subject location and their results
Date Location Average Daily Traffic (ADT) Average Speed (MPH) 85% Speed (MPH) % of drivers traveling over 10MPH above the speed limit
March 2024 47th Dr s/o 121st Pl 2250 22.9 26.0 0.1
March 2024 121st Pl w/o 47th Dr 2250 26.1 32.4 11.0

The 85% speed is the commonly accepted engineering value indicating the speed at which 85% of drivers fall under and is found to be the speed at which the majority of drivers feel is a safe speed given the roadway conditions and surrounding environment. The 85% speed is also the value typically used to set speed limits and evaluate compliance with speed limits.

Residential roadways with a consistent speeding problem which may be effectively altered with traffic calming device installation typically have greater than 3% of drivers traveling at greater than 10 mph over the speed limit.

Based upon the cumulative results of the neighborhood traffic data, the Public Works Departments through the NTS program have determined that traffic calming device installation is necessary upon 47th DR NE and 121st PL NE from 45th Ave to 1200047th DR NE.

A survey will be performed in March of 2025 to solicit approval from all properties within 600' of a proposed traffic calming device or whose sole access(es) would be impacted by traffic calming device installation. To move forward with the installation, greater than 60% of respondents are required to tally "yes" for the proposal.

This NTS project proposal includes the installation of two (2) speed tables at the following approximate locations: 

  • 4517 121st Pl NE (Speed Table)
  • 12107 47th Dr NE (Speed Table)