Optimal Transportation Scheduling of Prefabricated Components Based on Improved Hybrid Differential Firefly Algorithm

Table 6

Round-trip time of component transportation between the prefabricated factory and the construction site.

a	j	Daj (km)	Traffic flow	Nontraffic impedance (min)						Traffic impedance (min)
				Transportation t0			Return			Transportation t			Return t′
				(i)	(ii)	(iii)	(i)	(ii)	(iii)	(i)	(ii)	(iii)	(i)	(ii)	(iii)
a = 1	1	18.0	3750	20	20	22	18	18	20	22	21	24	20	19	22
	2	21.4	3650	23	23	26	21	21	23	26	25	28	24	23	26
	4	15.0	3780	16	16	18	15	15	16	18	18	20	17	16	18
	8	30.0	3450	33	33	36	30	30	33	35	34	39	32	32	35
a = 2	3	18.0	3655	20	20	22	18	18	20	22	21	24	20	19	22
	5	33.5	3750	37	37	40	34	34	37	41	39	45	37	36	41
	6	12.5	3450	14	14	15	13	13	14	15	14	16	14	13	15
	7	20.0	3780	22	22	24	20	20	22	24	23	27	22	21	24
a = 3	9	25.0	3550	27	27	30	25	25	27	30	29	33	27	26	30
	10	12.5	3560	14	14	15	13	13	14	15	14	16	14	13	15
	11	20.0	3450	22	22	24	20	20	22	24	23	26	22	21	24
	12	11.3	3360	12	12	14	11	11	12	13	13	15	12	12	13