This problems seems to have gotten worse over the past month or two. Please asks VDOT to adjust the timing of this light if it concerns you as well. You can contact VDOT at:
http://www.virginiadot.org/travel/citizen.asp
And include the below message:
Intersection of Chain Bridge Rd/Rt 123 and Jermantown Rd in Fairfax County Virginia (in the Oakton area).
RE: Traffic Light
The timing of this traffic light during the AM and PM rush strongly favors Rt123 over Jermantown Road despite the fact that very little traffic waits on Rt123 and traffic very frequently waits multiple cycles on Jermantown Rd.
Specifically during the AM Rush (approx 0630-0715) vehicles traveling East on Jermantown Rd often have to wait 2-3 cycles to cross Rt123. However traffic is never stopped more then 3 cars deep on Rt123 in either direction.
Specifically during the PM Rush (approx 315pm-6pm) vehicles traveling West on Jermantown Rd often have to wait 6 or more cycles to cross Rt123. Traffic on Rt123 is not back up at all during this time.
This problem seems to be able to be solved with a simple traffic signal adjustment.
Thank you.