Some crossings may have no CSD, where the 6 feet distance from the near rail is to the edge of the adjacent street as illustrated in Figure 3-3. Crossings with no CSD will generally have lower advance preemption time because no vehicles should be downstream of the crossing, which leads to a shorter queue start-up distance and track clearance green interval. When a crossing does not have a CSD, the designer should place railroad stop line upstream of the crossing in order to discourage motorists from stopping downstream of the grade crossing.

This scenario does not require any special manipulation of TxDOT Form 2304 except entering zero for the CSD.