Uncontrolled Intersection - Sight Triangles A two-lane major street, Palm (East-West), makes a four-way uncontrolled intersection with a minor street, Oak (north-south). A business building is proposed to be constructed on the northwest corner of the intersection. A building is going to be constructed 40 feet from Palm Street curb line. We know the followings about each street: Palm Street: (Major) 50 feet curb to curb (East-West) Approach speed is 40 mph Oak Street: 40 feet curb to curb (North-South) (Minor) Radii at the corners (curb line) where Palm Street intersects Oak Street is 20 feet or R=20 feet Approach speed is 25 mph Assume driver's eye line of sight) is 5 feet from the centerline of each street. Determine the following: b) c) What are the lengths of sight triangles for drivers on both streets? Draw the intersection on a scale (1 inch = 40 feet) showing curb, centerline, lines of sights and dimensions for each street. Draw the sight triangle only for northwest corner. How many feet minimum does the building need to be constructed away from the Oak Street curb in order to be clear of the sight triangle? How many parking spaces are required to be removed from each street to clear line of sight at the northwest corner? - Assume 20 feet for each parking space. Do not include the corner area. d) Uncontrolled Intersection - Sight Triangles A two-lane major street, Palm (East-West), makes a four-way uncontrolled intersection with a minor street, Oak (north-south). A business building is proposed to be constructed on the northwest corner of the intersection. A building is going to be constructed 40 feet from Palm Street curb line. We know the followings about each street: Palm Street: (Major) 50 feet curb to curb (East-West) Approach speed is 40 mph Oak Street: 40 feet curb to curb (North-South) (Minor) Radii at the corners (curb line) where Palm Street intersects Oak Street is 20 feet or R=20 feet Approach speed is 25 mph Assume driver's eye line of sight) is 5 feet from the centerline of each street. Determine the following: b) c) What are the lengths of sight triangles for drivers on both streets? Draw the intersection on a scale (1 inch = 40 feet) showing curb, centerline, lines of sights and dimensions for each street. Draw the sight triangle only for northwest corner. How many feet minimum does the building need to be constructed away from the Oak Street curb in order to be clear of the sight triangle? How many parking spaces are required to be removed from each street to clear line of sight at the northwest corner? - Assume 20 feet for each parking space. Do not include the corner area. d)