Priority · speed-reduction prioritisation — pilot slice

TAC programme view: which corridors buy the most harm reduction per unit of mobility cost. Ranked evidence pack — locked methodology, fixed measured demand.

Scenario:

Harm-reduction supply curve

Corridors sorted by efficiency; each step = one corridor. Read: "the first N corridors deliver X FSI/yr saved at Y thousand vehicle-hours." Direct speed-change cost only, no reassignment.

Signals & outliers — what the measured speeds revealed

Ranked corridors

Road (locality)	km	AADT	v̄ meas	p85	limit	FSI/yr	ΔFSI/yr	cost veh-hr/yr	eff /1k vh

Methodology: ΔFSI = FSI_exp × (1−e^(β·Δv̄)), β=0.08 (Elvik et al. 2019 meta-analysis); Δv̄ = 0.5 × limit change against measured mean operating speed; mobility cost = AADT × 365 × L × Δ(1/v). Sources: crashstats CR screening layer (2012–2024), banded AADT layer, connected-vehicle speed tiles. Casualty-savings claims pending EB/CMF validation gate. crashstats.com.au family.