[quote='greensky52' pid='1683' dateline='1277368019']
I have tried the calculation and layout of year 1998, and have some confusions as follows:
3. In the mod answer, I notice he uses 3 aspect in station E, I agree. However, he uses 4aspect around junction D and F while using 3 aspect in straight line, eg section A & H. My view is it should use 4 aspect in straight line without any junctions and stations, but using 3 aspect in those lower speed area. But the mod answer seems showing the contrary meaning. Am I wrong again? Or is it his error?
4. I have reviewed the model answer in study package, and the layout shows the signal spacing distance for 3 aspect or 4 aspect may be 1000m or more, but according to my calculation, the signal spacing distance for 3 aspect is between 773m to 868m, and 387m to 515m for 4 aspect? It is impossible for a signal spacing bigger than 868m
I have tried the calculation and layout of year 1998, and have some confusions as follows:
3. In the mod answer, I notice he uses 3 aspect in station E, I agree. However, he uses 4aspect around junction D and F while using 3 aspect in straight line, eg section A & H. My view is it should use 4 aspect in straight line without any junctions and stations, but using 3 aspect in those lower speed area. But the mod answer seems showing the contrary meaning. Am I wrong again? Or is it his error?
4. I have reviewed the model answer in study package, and the layout shows the signal spacing distance for 3 aspect or 4 aspect may be 1000m or more, but according to my calculation, the signal spacing distance for 3 aspect is between 773m to 868m, and 387m to 515m for 4 aspect? It is impossible for a signal spacing bigger than 868m
PJW