Question: A sketch map with contour lines at 25m intervals is provided. The red lines on the sketch map show two possible new road alignments (X

A sketch map with contour lines at 25m intervals is provided. The red lines on the sketch map show two possible new road alignments (X and Y) to cross a river and climb to the flatter high ground. The bearing and distance of each straight is shown and the radius proposed for each of the horizontal curves is also shown. The green lines are the ends of existing roads which need to be joined. These roads are on the natural surface. The land below the 100m contour is unoccupied bush land while above the 100m contour is developed farmland in private ownership.

The proposed routes have been drawn by bureaucrats, where their main aim is to avoid existing houses. Where possible the road should follow the natural surface minimising cut and fill. The proposal has now been passed to the Engineering Department to assess the two possible routes. Your task consists of the following four parts.

Part 1(Done):Using the horizontal curve data shown (where R is the radius of each curve) calculate the length of each bypass (to 1 decimal place). Also list the chainages of each T.P. along each road. It is not necessary to show all of your working/calculations, but it would be good to show the results of individual calculations.

A sketch map with contour lines at 25m intervals is provided. The

Part 2:

Question: red lines on the sketch map show two possible new road alignments

Some members of council have asked for clarification about the proposed road options as they do not understand the plan provided.

For each road, section by section, as shown at the bottom of the page, describe the roads horizontal alignment in a sentence or two. In a few paragraphs, describe the longitudinal slopes of the natural surface along each section. Explain where you would expect substantial vertical curves to be needed in the road design by suggesting appropriate I.P. locations. Further, you must draw attention to any structures that would be needed, such as bridges and bridge approaches. Also identify any areas where you would expect large depths of cut or fill to occur, or difficulties in meeting the design criteria due to the grade of the land.

2. While the entire road will need to eventually have a final accurate survey completed, for those areas that you have mentioned in part 2 above, to assist with assessing each roads suitability, more detailed survey work on site will be undertaken immediately. As part of this section, you must suggest possible R.L.s for the decks of any bridges and the impacts that those R.L.s will have on the road design. As part of this assessment process you may also wish to recommend areas to investigate for possible minor horizontal deviations (for example, less then 800m in length and less than 150m sideways deviation) to be included in such survey work if you feel it would help the road design. Please describe what information each of those site surveys should obtain.

Road X

Section 1: Ch 00 to T.P.2 (the end of the 500m Horizontal Curve)

Horizontal Alignment

Vertical Alignment