Chapter 266 is hereby amended by inserting the following section, as Section 120G:

  Whoever knowingly, not being  authorized by a written permit issued by the municipality,

stands or remains in or on any public way with the intent or effect of disputing traffic thereon, or whoever causes another to do the same, or whoever erects or places on a public way any barrier of any sort so that traffic might be affected, shall be punished by a sentence by imprisonment in the House of Correction for not more than one year, and a fine of not more than $2,500.

  A conviction or findings of sufficient facts on any charge brought under this section shall be prima facie evidence of liability in any action brought in connection with the following:

          a.  Any damage to any property, whether privately or publicly owned, including but not limited to vehicles;

          b.  Any continuing injury, illness, or death reasonably attributable to a delay in receiving medical or emergency services caused by prohibited actions in this section

          c.  Any property loss suffered that is reasonably attributable to the delay in response of emergency vehicles to any emergency.