1. [15] Roads and Highways Department (RHD) is trying to rank 3 black spot segments (A, B and C, each 1 mile long, i.e. L = 1) on its Dhaka-Sylhet National Highway. Do the followings (show related calculations): (a) Predict the numbers for fatal, injury and PDO type crashes of those three black spot segments before installing countermeasures. (b) Rank the three black spot segments following to the RSI concept. (c) Rank the three black spot segments following the EPDO concept. (d) Show your final answers in a table. Notes: Total annual Fatal crashes without installing countermeasures should be predicted by the following SPF formula: NSPF-fatal = 2.7 x AADT XL X 365 x 10(-6) Total annual Injury crashes without installing countermeasures should be predicted by: NsPF-Injury = 6 x AADT x L x 365 x 10(-6) Total annual PDO crashes without installing countermeasures should be predicted by: NSPF-PDO = 2 x AADT XL X 365 x 10(-6) Crash Type Fatal Injury PDO Cost per Crash (in million taka) 3 0.4 0.05 Crash Weight (for EPDO method) 100 10 1 2. [15] RHD is considering installing a concrete Jersey Barrier (Divider) type countermeasure at the black spot segment indicated for you in the ID-specific data from the table attached at the end. Do the followings (show related calculations): (a) Calculate the annual costs of crashes with and without installing the concrete Jersey Barrier countermeasure (Divider). (b) Calculate the annual benefit (A) solely based on the reduction of crashes due to installing the divider. (c) Calculate the present value (P) of benefit (B) due to any reduction of crashes. (d) In terms of road safety, calculate the benefit-cost ratio (B/C) based on the present values of benefit and cost (e) Suggest, only from an economic consideration, if RHD should or should not install this countermeasure based on the B/C ratio you found. Show reason for your suggestion. (f) show major findings in a table. Given: Use the data and findings from Question #1, as required. Total annual crashes after installing a countermeasure should be predicted using the following formula: Npredicted = NSPF CMF CF Total economic assessment year, n = 5 years; Traffic Growth Rate = 0% (no change in AADT is in the coming 5 years); Use a discount rate of 5%; Present value of installing the concrete Jersey Barrier, C = 10 million taka (per mile). Question 2 Question 1 AADT B CMF CF C A B C Segment to be analyzed A 5000 6000 7000 0.41 1.00 0.90 0.80 1. [15] Roads and Highways Department (RHD) is trying to rank 3 black spot segments (A, B and C, each 1 mile long, i.e. L = 1) on its Dhaka-Sylhet National Highway. Do the followings (show related calculations): (a) Predict the numbers for fatal, injury and PDO type crashes of those three black spot segments before installing countermeasures. (b) Rank the three black spot segments following to the RSI concept. (c) Rank the three black spot segments following the EPDO concept. (d) Show your final answers in a table. Notes: Total annual Fatal crashes without installing countermeasures should be predicted by the following SPF formula: NSPF-fatal = 2.7 x AADT XL X 365 x 10(-6) Total annual Injury crashes without installing countermeasures should be predicted by: NsPF-Injury = 6 x AADT x L x 365 x 10(-6) Total annual PDO crashes without installing countermeasures should be predicted by: NSPF-PDO = 2 x AADT XL X 365 x 10(-6) Crash Type Fatal Injury PDO Cost per Crash (in million taka) 3 0.4 0.05 Crash Weight (for EPDO method) 100 10 1 2. [15] RHD is considering installing a concrete Jersey Barrier (Divider) type countermeasure at the black spot segment indicated for you in the ID-specific data from the table attached at the end. Do the followings (show related calculations): (a) Calculate the annual costs of crashes with and without installing the concrete Jersey Barrier countermeasure (Divider). (b) Calculate the annual benefit (A) solely based on the reduction of crashes due to installing the divider. (c) Calculate the present value (P) of benefit (B) due to any reduction of crashes. (d) In terms of road safety, calculate the benefit-cost ratio (B/C) based on the present values of benefit and cost (e) Suggest, only from an economic consideration, if RHD should or should not install this countermeasure based on the B/C ratio you found. Show reason for your suggestion. (f) show major findings in a table. Given: Use the data and findings from Question #1, as required. Total annual crashes after installing a countermeasure should be predicted using the following formula: Npredicted = NSPF CMF CF Total economic assessment year, n = 5 years; Traffic Growth Rate = 0% (no change in AADT is in the coming 5 years); Use a discount rate of 5%; Present value of installing the concrete Jersey Barrier, C = 10 million taka (per mile). Question 2 Question 1 AADT B CMF CF C A B C Segment to be analyzed A 5000 6000 7000 0.41 1.00 0.90 0.80
