⦁ MTOD 912.138 identifies…

⦁ MTOD 912.138 identifies the “side view” of the post as the side that the rail attaches to and the “front view” as the side of the post at right angles to the rail. This is backwards in terms of how other guide rail posts are identified (such as OPSD 912.136). The definition of a posts “side” and “front” should be consistent between the various systems to avoid confusion.
⦁ MTOD 912.138 side, front and isometric views of the entire post are drawn with breaks at the ground level and dimensions from the breaks to the top of the system are provided. It is not obvious that these breaks occur at ground level and should be labelled as such for clarity.
⦁ MTOD 912.171 should have the location of the edge of shoulder identified in Section A-A, as well as the minimum distance to the rounding breakpoint.
⦁ MTOD 912.440 references a height of 800 mm for the parapet wall, but SSD’s for parapet walls show the height varies between 800 and 825 mm.
⦁ Is MTOD 912.440 or MTOD 912.490 intended to be applied to parapet walls for MUP separation barriers? If so, is there any shielding for the rear (pedestrian / cyclist facing) side of the installation?
⦁ Perhaps a note should be added to MTOD 912.494 to state that the dual tapers on the concrete buttress / parapet wall are not shown for clarity. Furthermore, since the ends of parapet walls may be tapering in height (and may have a minimum height of either 800 or 825 mm), shouldn’t these variations be noted and mounting dimensions included?
⦁ Regarding OPSS 721, there are several instances of the use of “guiderail” as a single word; for consistency, this should be two words.