Section 156. Penalty, and notice on bridge

The town superintendent may fix
  and prescribe a penalty, not less than one or more  than  five  dollars,
  for riding or driving faster than a walk on any bridge in his town whose
  chord  is  not  less  than  twenty-five  feet  in length, and put up and
  maintain in a conspicuous place, at each end of the bridge, a notice  in
  large  characters,  stating each penalty incurred. Whoever shall ride or
  drive faster than a walk over any bridge, upon which notice  shall  have
  been  placed,  and  shall  then be, shall forfeit for every offense, the
  amount fixed by such town superintendent, and specified in the notice.