Some flexi-posts even would be nice as an interim solution to this.

The lack of consistent enforcement helps this kind of behavior. The lane is very clearly marked.
Is anything done by the PD to help change those bad habits ?

Repainting and writing more "BIKE LANE" might help.

I think the idea of semi-flexible posts is a good one to prevent parking

Thank you for reporting. Issues like double parking, cars in bike lanes, etc. should be reported as they occur to the Cambridge Police Department Non-Emergency line at 617-349-3300 so that units can be dispatched to the location at the time such issues are seen. This system is best suited to respond to service requests like potholes, street lights, rodent issues, etc. that can be assigned to staff and addressed in a timely manner.

However, we will share this concern with the appropriate departments so that this report can be taken into consideration as we study future roadway design and enforcement efforts.

If you would like to discuss this traffic situation with a staff member in more detail, please contact the Traffic Department at trafficengineering@cambridgema.gov.