Riding toward Leiden, there is one large yellow Omleiding sign right after the long tunnel below the tracks (88).
If you ignore this sign and jump over the large concrete blocks on the path, you will have lots of company, both directions.
|A cyclist leaving the path that was supposed to be closed for construction.|
|Well worn paths circumventing the barriers to the path.|
In fact, don't even approach the concrete blocks.
You can turn in quickly on your left and cross some mud to the path.
Everyone is doing it.