Abstract: A method of modifying current traffic roads to create more efficient transportation of both full-size vehicles and mini-size vehicles includes a step of applying a material along the center of a conventional traffic lane of an automobile roadway to form at least a line of marks in the middle of the traffic lane, such that the line of marks is parallel to a set of bordering lines of the traffic lane and the line of marks is dissimilar to the set of bordering lines of the traffic lane to create at least two mini-vehicle lanes within each of the traffic lanes.

Abstract: A writing board with an automatic erase device includes a frame, a driving roller and a supporting roller rotatably mounted on the frame in a parallel manner, an endless writing sheet trained around the driving and supporting rollers to form a front exposed writing surface and a back surface, a supporting board interposed between the front writing exposed writing surface and the back surface of the writing sheet for providing a fixed rigid supporting to the front exposed surface, and an erase device positioned behind the back surface of the writing sheet and mounted on the frame. The erase device includes at least an elongated eraser which is extended along a width of the writing sheet and is disposed in the touching with the back surface of writing sheet, so that a writing content on the front exposed writing surface can be erased by the eraser automatically when the writing sheet is rotated by the driving roller.