1What calculation do I need for designing a roundabout such

1-What calculation do I need for designing a roundabout?

such as Traffic flow, crash rate, and peak hour.

2- how to estimate the cost of the roundabout, including the costs of materials

Solution

1) traffic flow = vehicle par hour (calculate speed of vehicle)

Crash rate ,

R = C×100000000÷(365×V×N×L)

Where , R= roadway departure crash rate

C= Total no. Of roadway departure crash rate

V =traffic volume(In AADT)

N= no.of years data

L= length of roadway in miles

Peak hour,

= Area × height due to unit hydrograph÷( discharge)

2) for the estimation of cost materials,

Find the cost of aggregate , cement , Labour charge , plastering charge etc