With these ideas in mind, a desk study was undertaken so as to come up with techniques for data collection. Classified directional traffic counts and Origin (O/D) studies were done at survey locations –Destination and the study programme as depicted in Table 3.1; Table 3.1: Points of Study Locations Changamwe about Manual counts 13th December 2011 and 14th December – ( junction of A109 and A109A towards 2011 Mombasa ) Airport junction Manual counts 13th December 2011 and 15th December – (lies along A109A en route to airport) 2011 Refinery junction Manual counts 14th December 2011 and 16th December – (lies along A109A en route to refinery) 2011 Kona Relly Manual counts 15th December 2011 and 16th December – (lies at the junction heading to Miritini 2011 and Magongo estates) Manual counts 17th December 2011 and 18th December Kwa Jomvu – ( junction of A109 and A109A towards 2011 Nairobi) O/D Surveys 15th December 2011 – The points are illustrated in Fig 1.2. Axle Load Surveys were also conducted on the road using a mobile weigh-bridge to be able to design a road pavement which is capable of carrying future traffic load. It also covered commodity carrying traffic such as Medium Goods, Heavy Goods, Buses, Tractors and some Light trucks. An assessment of journey times was made on Changamwe - Kwa Jomvu Miritini –Magongo – (A109A).The details of this study are given in Chapter 4. Topographical Survey The survey was carried out by mapping from aerial photography. A digital terrain model was generated from the aerial photography which was then used for generating the profile. Climate and Rainfall Data The area experiences a bimodal rainfall pattern, with long in March-May and short rains from October-December. However a relatively wet, narrow tropical belt lies along the Indian Ocean coast. Behind the coastline large areas of semi-arid and arid desert lands stretch. The project area receives an annual rainfall that ranges on average between 544-1784mm in the narrow tropical belt represented by the available data for Mombasa airport. The rains are much influenced by the proximity to Indian Ocean. The movement of air masses, between the two high pressure belts in the south
With these ideas in mind, a desk study was undertaken so as to come up with techniques for data collection. Classified directional traffic counts and Origin –Destination (O/D) studies were done at survey locations and the study programme as depicted in Table 3.1; Table 3.1: Points of Study Locations Changamwe about ( junction of A109 and A109A towards Mombasa ) Manual counts – 13th December 2011 and 14th December 2011 Airport junction (lies along A109A en route to airport) Manual counts – 13th December 2011 and 15th December 2011 Refinery junction (lies along A109A en route to refinery) Manual counts – 14th December 2011 and 16th December 2011 Kona Relly (lies at the junction heading to Miritini and Magongo estates) Manual counts – 15th December 2011 and 16th December 2011 Kwa Jomvu ( junction of A109 and A109A towards Nairobi) Manual counts – 17th December 2011 and 18th December 2011 O/D Surveys – 15th December 2011 The points are illustrated in Fig 1.2. Axle Load Surveys were also conducted on the road using a mobile weigh-bridge to be able to design a road pavement which is capable of carrying future traffic load. It also covered commodity carrying traffic such as Medium Goods, Heavy Goods, Buses, Tractors and some Light trucks. An assessment of journey times was made on Changamwe –Magongo - Kwa Jomvu – Miritini (A109A).The details of this study are given in Chapter 4. Topographical Survey The survey was carried out by mapping from aerial photography. A digital terrain model was generated from the aerial photography which was then used for generating the profile. Climate and Rainfall Data The area experiences a bimodal rainfall pattern, with long in March-May and short rains from October-December. However a relatively wet, narrow tropical belt lies along the Indian Ocean coast. Behind the coastline large areas of semi-arid and arid desert lands stretch. The project area receives an annual rainfall that ranges on average between 544-1784mm in the narrow tropical belt represented by the available data for Mombasa airport. The rains are much influenced by the proximity to Indian Ocean. The movement of air masses, between the two high pressure belts in the south
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