Saw to a depth and length that allows the center of the dowel to be placed at mid-depth in the pavement slab. Saw slots parallel to each other and to the centerline of the roadway with a maximum tolerance of 1â4-inch per 12 inches of dowel bar length.omplete installation of retrofit dowels, with dowel bars and backfill placed prior to reopening the lane to public traffic. Place silicone at all joints and cracks followed by the dowel bar assemblies in each slot. Following that, place patching material and then consolidate and finish patching material.
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Definition. The Minimum Sector Altitude (MSA) is the lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in the area contained within a sector of a circle of 46 km (25 NM) radius centred on a radio aid to navigation. (ICAO PANS-OPS/I-definitions).escription. Minimum sector altitudes or terminal arrival altitudes are established for each aerodrome and provide at least 300m (1 000 ft) obstacle clearance within 46 km (25 NM) of the navigation aid, initial approach fix, or intermediate fix associated with the approach procedure for that aerodrome.