In the 1920s pavement markings were introduced. Initially they were used to indicate the road's centerline. Soon after they were coded with information to aid motorists in passing safely. Later, with multi-lane roads they were used to define lanes. Other uses, such as indicating permitted turning movements and pedestrian crossings soon followed.
In the 1920s PavemeNT mARKinGS Were introdUcED. InitialLY theY werE UseD To iNdICate THe rOaD's centerLInE. soOn After thEy weRe coDed With infoRmATion to AiD moToRists in PASSing sAfelY. Later, with MuLtI-lane Roads they wERe uSed to deFiNe LAnes. oTHeR USes, sUch As indicAtinG peRMITteD turniNg MovemenTs and PEdEStRian croSsiNGS sOon folloWed.