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University of the West of England – Centre for Transport and Society
UBGMFX-15-M Transport Infrastructure Engineering
Coursework Assignment 1 – Design Portfolio
To be submitted: A succinct report with appendices containing the designs
Weighting: 50% of the module mark
Submission date: 29th April 2021
This coursework involves two designs. Design 1 is concerned with provision of South-west facing slip-roads between the M32 and Stoke Lane for Metrobus. Design 2 is concerned with the development of an alignment for a high-level cycle route across the valley of the River Frome.
Design 1: Metrobus South-west facing on and off slip-roads on the M32 at Stoke Lane, Bristol
Metrobus (for more information click here) has been constructed in Bristol. The plan of the routes shown here indicates the routes for Metrobus. Metrobuses on the proposed North Fringe to Hengrove route need to interchange between the M32 (South) and Stoke Lane (North).
Some people suggested during the planning stages that the bridge and slip road arrangement constructed for Metrobus to leave the M32 were unnecessarily costly because of the requirement for the additional bridge. This recently constructed bridge lies North of the current Stoke Lane bridge and its plans are shown in the file ‘Metrobus proposals at Stoke Lane.pdf’ on Blackboard.
Your task is to develop an alternative design which provides South Facing slip-roads just for Metrobus onto and off the M32 from Stoke Lane. This would have cost considerably less, and also would have allowed for shorter journey times between the M32 and Stoke Lane.
You will need to submit the following, which will form appendices to your design report:
Appendix D1.1: A design statement up to a single side of A4 a) describing the problem and b) outlining the approach to the solution you have developed.
Appendix D1.2: A tabulation of the assumptions you have adopted for the design and calculations you have made based on these (Annex 1 to this brief provides a tabulation of design parameters that you will need to make assumptions about for the design).
Appendix D1.3: A plan layout at an appropriate scale which shows the general arrangement of the proposed south facing slip-roads (an off-slip on the North West side of the motorway and an on-slip on the south west side of the motorway between Stoke Lane and the M32).
Appendix D1.4: A fully-dimensioned cross-section at a particular chainage chosen by you on one of the slip roads (either the on-slip or the off slip) drawn to an appropriate scale showing the actual batter slope lengths both sides of the construction that connect to existing ground level (NB This should *NOT* be a generic cross section). Assume the batter slopes are at 1:2.
Appendix D1.5: A statement on a single side of A4 concerning ways in which the design will safely ensure that only Metrobus will use the slip-road. You will need to address the issue of how general traffic vehicles which mistakenly enter the slip-road(s) are to be dealt with. You may wish to consider Intelligent Transport System applications in this regard.
You should use Digimap to provide you with the necessary base mapping to create the design (http://digimap.edina.ac.uk/, UWE is a subscribing university and you can log-in using your UWE log-in. Support for login issues is provided by the UWE library. You can download and print Ordnance Survey maps using ROAM. You will be instructed in the use of Civils 3D and it is expected that you use this for the assignment.
Ordnance Survey Data Downloads. You will need to reference the Design Manual for Roads and Bridges, especially the sections noted in Annex 1 (http://www.standardsforhighways.co.uk/dmrb/).
As further background, you may wish to look at the following historical view of the road as it was being built. http://news.bbc.co.uk/local/bristol/hi/people_and_places/history/newsid_7767000/7767453.stm
Design 2: High level cycle route across the valley of the River Frome
Routes to cycle between UWE (and the North Fringe beyond UWE to the North West) and Downend (and its hinterland of Staple Hill and Mangotsfield to the east and south) and are not direct, as shown on the plan in Figure 1. There is a proposal to create a high level cycle bridge across the valley of the River Frome at or near the current location of the Ha’penny Bridge, as also shown on Figure 1.
Figure 1 Existing cycle routes between UWE and Fishponds and Downend.
Via Blackberry Hill
Via Ring Road
The cycle route is proposed to connect College Road with Sheldrake / Begbrook Drive (near to Begbrook primary school). There are existing footpaths between these two routes as shown by the blue line in Figure 2. Note that the ring road cycle route carries 600 cycles each way per day, the majority of which are in the peak period. You should assume that the bridge will attract at least half of these cyclists and many more besides.
Figure 2 Existing Routes between College Road and Sheldrake Drive
End point for the alignment design
Sheldrake Drive end point
Your task is to design the vertical and horizontal alignment of a cycle route between the end points of the proposed cycle route as shown in Figure 2. Only the end points and levels of the end points are fixed. You can assume that you are able to use any land that you need between these two end points apart from:
land shaded pink in Figure 2 (the old hospital site)
land coloured brown within the curtilage of Begbrook Primary Academy on Sheldrake Drive
land taken by the College Road allotments.
You need to accommodate pedestrians in your design, and these need to be separated from the cycle route by a kerb. You should view this video for reasons as to why this is important: https://vimeo.com/379255176/d0b6498c1b.
You will need to submit the following, which will form appendices to your design report:
Appendix D2.1: A design statement up to a single side of A4 a) describing the problem and b) outlining the approach to the solution you have developed.
Appendix D2.2: A tabulation of the assumptions you have adopted for the design and calculations you have made based on these.
Appendix D2.3: A plan layout at an appropriate scale which shows the horizontal geometry of the proposed cycle route.
Appendix D2.4: A long-section at an appropriate scale which shows the vertical geometry of the proposed cycle route. A critical feature of the design is the level of the proposed bridge and this should be clearly stated.
Appendix D2.5: A statement concerning the proposed surfacing and lighting for the route, and this should be supported by appropriate sketches of cross-sections to demonstrate construction features.
As for the slip road design, you should use Digimap to provide you with the necessary base mapping to create the design (http://digimap.edina.ac.uk/) and level information. Instead of making neat drawings for you plan and long-section, you may wish to use Civils3D.
Your primary sources of reference for this design shall be the following.
Design Manual for Roads and Bridges CD195 Designing for cycle traffic (http://www.standardsforhighways.co.uk/ha/standards/dmrb/vol6/section3/CD%20195%20Designing%20for%20cycle%20traffic-web.pdf) and the associated e-learning (https://cycletraffic-elearning.com/) (Note: John Parkin was a co-author of the design guidance and masterminded the pedagogy behind the e-learning)
Local Transport Note 1/20 Cycle Infrastructure Design. https://www.gov.uk/government/publications/cycle-infrastructure-design-ltn-120
In addition, you may wish to reference:
Design Guidance Active Travel (Wales) Act 2013: http://gov.wales/docs/det/publications/141209-active-travel-design-guidance-en.pdf
London Cycle Design Standards: https://tfl.gov.uk/corporate/publications-and-reports/cyclingYou may also wish to reference the following, although some of these are now regarded by the community as being rather out of date
You may wish, for general reference purposes, to look at suggestions that have been made by John Grimshaw in respect of routes across the Frome valley at http://www.johngrimshawassociates.co.uk/downloads/UWE.pdf.
You will submit a report the main body of which will be 1500 words in length discussing what you have learned from the two design tasks. This report will have appendices, exactly as lettered and numbered in the individual tasks above, which present the designs you have prepared. The report and its appendices will be contained in a single WORD file. As well as an introductory section which references the appendices, the report should have two further sections which reflect on the following:
The cognitive process used in developing design options, especially the way you develop and evaluate options
The strengths and weaknesses of the way design guidance is presented
The work that you undertake will be assessed according to:
The clarity of your design statements (Appendices D1.1 and D2.1)
The appropriateness of tabulation of assumptions you make for the design (Appendices D1.2 and D2.2)
The appropriateness of the design as expressed in the layout plan and cross-section (slip-road) and long-section (cycle route) (Appendices D1.3 and D1.4, and Appendices D2.3 and D2.4)
The quality of the thinking in relation to preventing non-bus use of the slip roads (Appendix D1.5) and the nature of construction of the cycleway and footway (Appendix D2.5)
The quality of reflection in the main report on the design process and design guidance depth of understanding you demonstrate in use of design guidance (as demonstrated through your designs and in your evaluative report)
Compliance with requirement for a single WORD file submission
Each of the two designs will contribute 50% of the mark overall mark.
Annex1 Some definitions
Connector Road: A collective term for interchange links, link roads, slip roads and loops
Interchange: A grade separated junction that provides free flow from one mainline to another.
Slip Road: A connector road within a junction between a mainline carriageway and the local highway network, or vice versa, which meets the local highway network at-grade. Traffic using a slip road usually has to give way to traffic already on the mainline or on the local highway network.
Rural Motorway: A motorway with a speed limit of 70 mph (as opposed to an urban motorway with a speed limit of 60 mph or less)
Near Straight: A length of road with a radius no less than the Desirable Minimum Radius with Superelevation of 5% as required by TD 9 (DMRB 6.1.1) for the mainline design speed.
Nose: A paved area, approximately triangular in shape, between a connector road and the mainline at a merge or diverge, suitably marked to discourage drivers from crossing it.
Annex 2 Assumptions for Metrobus design
The following table identifies parameters that you will need to make assumptions about in respect of the suggested alternative of South facing on- and off-ramps connecting Stoke Lane to the M32 for Metrobus. Relevant document ID and paragraphs and tables from the Design Manual for Roads and Bridges (DMRB) have been identified. They can be found in the Road Layout section of the DMRB website.
Note that the design speed for the motorway main line is 120 km/hr, and the speed limit currently on Stoke Lane is 40 mph, hence a design speed of 70 km/hr.
Note that you should clearly state whether you have considered relaxations and whether you have then applied these to any parameters.
Finally, please make sure you are familiar with the verbal forms used in Design Manual For Roads and Bridges. See page 5 of GG101 in the General Governance and Scheme Governance section of the DMRB website.
Para / Table
Connector road design Speed
Stopping sight distance
CD122 and CD109
CD122 Para 5.13 and CD109 Table 2.10
Horizontal curve radius
Maximum vertical grade on slip road
CD122 and CD123
CD122 Para 5.7 and CD123 para 5.3 and 5.3.1
Merge onto mainline: Length of entry taper / nose ratio / nose length
Figure 3.14a and Table 3.21
Diverge from mainline dimensions: Length of exit lane / nose ratio / nose length
Figure 3.30a and Table 3.31
Lane width and hard shoulder width
CD 122 and CD127
CD 122 Table 5.17b and CD127 Figure 2.1.1N1b
Priority junction corner radii
Taper to ghost island for right turn pocket for the on-slip
Ghost island dimensions: 1) a, the turning length; 2) b the deceleration length; 3) c the through lane width; 4) d the turning lane width; and, 5) e the direct taper length.
Fig 6.3a, Para 6.4, Para 6.8, Para 6.10.1 and Para 6.11 and Table 5.22
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