Table 3.

Concentrations of Cu, Zn, Cd and Pb in roadside soils (mg/kg).

Variable	Class	Cu		Zn		Cd		Pb
		Mean	S.D.	Mean	S.D.	Mean	S.D.	Mean	S.D.
DIST	0	24.2	5.4	99.6	26.6	0.28	0.18	28.4	19.7
	10	23.1	7.9	97.7	25.1	0.23	0.07	23.0	10.0
	50	20.6	3.2	89.5	13.2	0.21	0.05	20.5	5.5
SOIL	meadow	21.4	3.5	88.5	14.5	0.21	0.05	19.9	8.3
	meals	26.6	10.4	109.9	24.5	0.29	0.21	28.9	14.9
	meahs	24.5	6.0	121.5	37.3	0.31	0.18	45.2	19.7
PRE	560	23.1	2.0	119.6	12.7	0.28	0.02	35.0	12.0
	570	28.7	14.6	97.2	21.0	0.24	0.06	28.4	13.8
	580	22.3	5.1	116.1	32.2	0.25	0.13	39.1	20.1
	590	23.9	4.0	99.4	14.2	0.26	0.12	27.1	11.7
	600	23.8	5.5	104.3	20.7	0.22	0.04	21.8	4.7
	610	21.4	3.5	88.3	18.6	0.23	0.13	19.3	9.4
ALT	4,100	21.4	3.3	85.3	14.3	0.21	0.05	17.6	4.0
	4,200	23.1	7.3	128.2	41.9	0.56	0.46	46.9	29.3
	4,300	20.3	1.2	99.2	1.1	0.16	0.00	20.6	1.1
	4,400	23.8	5.5	104.3	20.7	0.22	0.04	21.8	4.7
	4,500	23.9	4.0	99.4	14.2	0.26	0.12	27.1	11.7
	4,600	21.4	6.0	108.8	23.0	0.23	0.14	42.9	20.1
	4,700	26.4	12.2	106.9	34.4	0.25	0.10	32.6	18.4
	4,800	25.1	7.7	115.1	17.2	0.27	0.05	30.1	10.1
ROAD	ASPHALT	23.4	6.8	100.4	24.7	0.26	0.13	27.0	15.5
	GRAVEL	21.2	3.5	86.5	14.4	0.20	0.05	18.2	3.8
VOLUME	high	23.4	5.9	116.5	32.2	0.33	0.23	44.1	18.2
	middle	22.6	3.6	96.9	13.7	0.22	0.04	20.8	3.6
	low	22.5	6.6	89.0	17.2	0.22	0.05	18.9	6.1
REGION	MQ	22.6	3.6	96.9	13.7	0.22	0.04	20.8	3.6
	NL	23.4	5.9	116.5	32.2	0.33	0.23	44.1	18.2
	NMC	28.7	14.1	105.1	22.2	0.25	0.05	25.9	10.2
	ZE	21.4	3.3	86.1	14.6	0.21	0.05	17.7	4.1