This is better than paint and posts but I remember when they put down concrete bariers protecting the bike lanes, further west of there, cars kept crashing into the barriers and that pushed the barriers into the bike lane itself. Whatever the perminant solution ends up being needs to accomidate for crazy drivers doing crazy things.

From the article:

Colorful concrete planters have been placed in between the painted lines and plastic poles that mark the recently installed protected bike lanes.

“We decided as a BID board to add the planters,” said David Smulyan, the executive director of the East Side Business Improvement District.

“The whole idea of this project was to fit in with the mayor’s and the alderman’s idea of calmer, safer streets — and I think we’re seeing that already,” he added.

The east side BID will maintain the planters, but it’s a temporary plan.

“What we did here is what we call Rapid Implementation,” explained Mike Amsden, Multi-Modal Transportation Manager with the Department of Public Works.