of concrete as it permits economical manufacture with well defined shapes and of relatively accurate dimensions but could be of wood or other material a road 20 for vehicular traffic is shown crossing the railway track 12 at an angle 22 of approximately 90 u00b0 but the road could also cross at a significantly different angle concrete filler panels 24 and 26 have respective upper surfaces 28 and 30 located at substantially the same height as the upper surface 32 of the road 20 on either side of the crossing 10 in the particular grade crossing 10 shown in fig1 the road 20 is sufficiently wide such that two wide panels 24 arranged end to end are needed between the rails 14 and 16 similarly on each side of the track 12 two smaller side panels 26 have been placed end to end outside the rails 14 and 16 with their upper surfaces 30 aligned with the road surface 32 of the road 20 the wide panels 24 are known as gauge panels and the narrower panels 26 are known as field panels in constructing the grade crossing 10 the concrete filler panels 24 and 26 are lowered into place with a suitable hoist using hook eyes 34 which are provided in the panels for that purpose elastomeric rail boot or seal strips 36 and 38 are installed between the panels 24 26 and the rails 14 16 as shown also in fig2 tie pads 40 42 similar to each other except for their lengths are located directly on the tops of the ties 18 as may also be seen in.