Project Description : The Arterial Asphalt and Concrete Program maintains Seattle%s 1,581 lane miles of arterial streets
through resurfacing and
4 shows the relations between traffic flow density and average momentary speed on arterial streets with free traffic flow at different regulation speed, as well as with different numbers of lanes in different time periods.
When analysing the data acquired on average momentary speeds it was concluded that the actual speeds on arterial streets rarely exceeded the design speeds for arterial streets.
This study recommended using high pressure sodium lights (HPS) on collector and arterial streets and low pressure sodium lights (LPS) on residential streets.
After more discussion and presentations by city department staff members, the existing policy of using LPS lighting on residential streets and HPS lighting on collector and arterial streets was reaffirmed.
Most of the route is on the 2-lane arterial streets
of Addison, Standard, and Colton Streets with higher traffic volumes (ADT: 4,500 to 9,700).