13.26 Diagram 7233 does not have a horizontal bar for the two M1 lanes because the route number is repeated for each lane. The bar is used where the destination and/or route number is shown only once.
13.27 Diagrams 7220 and 7240 are used as advance direction signs where access to the junction (usually an exit slip road) is gained through the works area. Diagram 7220 is used for contra-flow systems where turning traffic crosses the central reserve. Diagram 7240 is used where traffic leaves the main carriageway without crossing the central reservation. The inclined arrow in each case is always angled at 45° upwards to the left. Design details are given in figure 13-18. Details of X-heights are given in figure 13-3 (diagrams 7285 and 7286).
128
