Option	Construction cost (million)	Crash reduction benefit (million)	Travel time disbenefits (million)	Annual death and serious injury crashes avoided	Benefit cost ratio
1a: Variable at schools	$9.1	$5.2	$4.1	0.3	0.1
1b: Variable at schools (accelerated)	$10.4	$6.2	$4.9	0.3	0.1
2a: Permanent at schools	$6.5	$91.8	$21.3	6.2	10.9
2b: Permanent at schools (accelerated)	$7.4	$103.7	$25.5	6.2	10.6
3: 40 km/h default	$12.5	$181.5	$287.0	10.7	-8.4
4: 30 km/h default	$26.2	$193.1	$366.0	11.2	-6.6
5a: 40 km/h default + variable at schools	$14.6	$175.4	$237.0	10.8	-6.3
5b: 40 km/h default + variable at schools (accelerated)	$16.1	$149.6	$277.0	10.8	-5.9
6: 40/30 km/h mix	$26.2	$278.1	$327.0	16.3	-1.8