5.6 General Intersection Improvements

Reduce emissions by reducing idling time at intersection with roundabouts.

Description

The general intersection improvements increase the efficiency of traffic flow at intersections by improving roadway capacity and interconnection, leading to reductions in travel times, delay, and stop-and-go driving.

Application

Major Arterials or high-capacity roadways with traffic signals.

$$\text{Daily Emission Reduction (grams/day)} = A + B$$

$$A = (D_{B} - D_{A}) \times \mathit{EF}_{I} \times V_{D,P}$$

Change in idling emissions from reduced vehicle delay times during the peak period

$$B = (D_{B} - D_{A}) \times \mathit{EF}_{I} \times V_{D,\mathit{OP}}$$

Change in idling emissions from reduced vehicle delay times during the off-peak period

Variables	(Unit)	Definitions
$D_{A}$	(hour)	Average vehicle delay at intersection after implementation
$D_{B}$	(hour)	Average vehicle delay at intersection before implementation
$\mathit{EF}_{I}$	(grams/hour)	Idling emission factor (NOX, VOC, PM, or CO)
$V_{D,P}$		Average daily volume for the corridor during peak hours
$V_{D,\mathit{OP}}$		Average daily volume for the corridor during off-peak hours

Source: Federal Highway Administration Southern Resource Center & Texas A&M Transportation Institute