Brand new number are projected according to established and you can expected future crash speed, seriousness speed, and you can AADT or VMT
The protection investigation causes the amount of injuries expected for for each and every seriousness method of (deadly, type A beneficial injury, type B burns, kind of C burns, and property wreck only). This type of prices are built towards Ft Instance and also the Alternative(s) on first year out of advantages therefore the final 12 months regarding investigation.
The fresh crash rates and you may severity used in the protection studies should echo the level of outline befitting the bonus-costs investigation. Freeze costs and you will seriousness are supplied for various facility brands (highway, expressway), to have certain corridors, as well as for particular internet sites (roadway markets or intersections). The brand new expert have to know if the security investigation is system-top, corridor-particular, otherwise site-particular according to the Choice(s) advised. System-height analyses work for plans that can cause people to move between business designs. Corridor-certain analyses are appropriate whenever developments protection a much bigger town but travelers patterns are expected to keep an equivalent.