Table 3.

Whole-body vibration exposures evaluated by vibration dose value (VDV) for axes x, y, and z and vector summations for haul truck drivers/operators at two stone quarries. VDV levels for the total sample times were normalised to full-shift equivalent levels to compare with the ISO health guidance caution zone (HGCZ) action and limit boundary level conditions of ISO 2631-1 and the European Union Directive 2002/44/EC presented in the European Union good practices guide (EUGPG)

Quarry	Haul truck driver/operator	Total sampling time (min)	A(8) VDV X-axis	A(8) VDV Y-axis	A(8) VDV Z-axis	A(8) VDV total	ISO 2631-1 8-hr shift1 equivalent HGCZ dominant axis	EUGPG 8-hr shift1 equivalent HGCZ dominant axis
1	1	82.4	10.8	19.8	10.8	33.4	Above HGCZ	Within HGCZ
1	1	98.9	9.2	15.9	13.9	29.2	Within HGCZ	Within HGCZ
1	1	83.8	11.3	18.2	14.5	33.3	Above HGCZ	Within HGCZ
1	2	75.6	12.5	13.8	12.2	28.8	Within HGCZ	Within HGCZ
1	2	75.6	12.5	13.4	12.6	28.6	Within HGCZ	Within HGCZ
1	2	81.8	12.4	13.3	9.5	27.2	Within HGCZ	Within HGCZ
1	3	61.3	13.4	13.8	15.1	30.9	Within HGCZ	Within HGCZ
1	3	60.0	12.7	13.6	14.3	29.7	Within HGCZ	Within HGCZ
1	3	66.7	11.7	14.2	15.5	30.1	Within HGCZ	Within HGCZ
2	4	85.0	13.3	18.9	17.5	36.8	Above HGCZ	Within HGCZ
2	4	65.6	12.2	16.6	12.0	31.2	Above HGCZ	Within HGCZ
2	5	67.2	13.5	16.8	17.3	34.8	Above HGCZ	Within HGCZ
2	5	47.5	13.7	13.4	18.8	32.8	Above HGCZ	Within HGCZ
2	6	59.3	11.0	11.8	9.3	24.4	Within HGCZ	Within HGCZ
	Mean	68.3	12.2	15.2	13.8	30.8	Within HGCZ	Within HGCZ
	STD	18.9	1.3	2.5	2.9	3.2

¹Full-shift applies to 9-hr daily exposure during a 10-hr shift for VDV; International Standards Organization (ISO). The multiple entries for individual drivers indicate the operation of different makes and models of haul trucks or ages of the same model. Units of VDV are presented as m/s^1.75. The activities associated with the haul truck driver exposures were loading, roadway travel with full load and no load, and dumping.