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 has determined that traffic calming device installation is necessary upon .
A survey will be performed to solicit approval from all properties within 600' of a proposed traffic calming devices or whose sole access(es) would be impacted by traffic calming device installation. To move forward with installation, greater than 60% of respondents are required to tally "yes" for the proposal.
This NTS project proposal includes the installation of three (3) speed tables, one (1) raised crosswalks, and three (3) traffic circles at the following approximate locations:
- 6908 58th St NE (speed table)
- 7024 58th St NE (speed table)
- 7205 58th St NE (raised crosswalk)
- 75th Ave NE & 56th Pl NE (traffic circle)
- 75th Ave NE & 55th Pl NE (traffic circle)
- 75th Ave NE & 52nd St NE (traffic circle)
- 7218 52nd St NE (speed table)