12.3 Compressed Work Week

Reduce work trips, VMT, and traffic volume by reducing days of travel to work site by employees and spreading trips outside the peak period.

Description

Compressed work weeks are work scheduling programs that condense a standard number of work hours into fewer than five days per week or fewer than 10 days per two-week period (e.g., four days at 10 hours per day or 80 hours over nine days).

Application

Employers who determine that productivity and services by their organization can be maintained by a compressed work schedule.

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

$$A = \mathit{VT}_{R} \times \mathit{TEF}_{\mathit{AUTO}}$$

Reduction in auto start emissions from trips reductions

$$B = \mathit{VMT}_{R} \times \mathit{EF}_{B}$$

Reduction in auto running exhaust emissions from trip reductions

$$C = N_{P} \times \mathit{TL}_{W} \times (\mathit{EF}_{B} \times \mathit{EF}_{A}) \times N_{D} / N_{D,\mathit{PRG}}$$

The number of participants multiplied by the average auto commute trip length multiplied by the change in auto running exhaust emission factors due to improved average travel speed multiplied by the percentage of the work week affected by the strategy

$$\mathit{VT}_{R} = N_{P} \times N_{D} / N_{D,\mathit{PRG}} \times 2 \ \text{trips/day}$$

The number of program participants multiplied by the number of work days eliminated divided by the number of work days within the scheduling program multiplied by two trips per day (round trip)

$$\mathit{VMT}_{R} = \mathit{VT}_{R} \times \mathit{TL}_{W}$$

The vehicle trips reduced multiplied by the average auto commute trip length

Variables	(Unit)	Definitions
$\mathit{EF}_{A}$	(grams/mile)	Speed-based running exhaust emission factor after implementation (NOX, VOC, PM, or CO)
$\mathit{EF}_{B}$	(grams/mile)	Speed-based running exhaust emission factor for participants before implementation (NOX, VOC, PM, or CO)
$N_{D}$		Number of work days eliminated
$N_{D,\mathit{PRG}}$		Number of work days in the scheduling program (five or ten days)
$N_{P}$		Number of participants
$\mathit{TEF}_{\mathit{AUTO}}$	(grams/trip)	Auto trip-end emission factor (NOX, VOC, PM, or CO)
$\mathit{TL}_{W}$	(mile)	Average auto trip length of commute to work
$\mathit{VMT}_{R}$		Reduction in daily automobile VMT
$\mathit{VT}_{R}$	(trip)	Reduction in number of daily vehicle trips

Source: CalTrans/CARB