 The 21-hour duration of the 105 km (65⅝ mile) journey from Koblenz to Frankfurt (am Main) implies that the average speed of a fully loaded horse-drawn cart was between 4 and 6 km/h (2½ and 3¾ m/h).This hourstone is one of 14 that were erected between Koblenz and Würges (a district of Bad Camberg) following a decree issued in 1789 (date on the hourstone) by the last Bishop and Prince-elector of Trier, Clement Wenceslaus of Saxony.Although only 8 of the initial 14 hourstones remain, these monuments of Germany's more distant past are not under preservation order.