1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170 
ushed trucks revealed
Page 7
If you've noticed an error in this article please click here to report it so we can fix it.
rransport Secretary Cecil cinson saw the next genion of "quiet" heavy vehiin action at the Transport Road Research Laboratory week. Truck manufacturIveco Ford, Leyland Daf, and Foden demonstrated Is they have developed :h emit less than 80dB(A) )ise at maximum revs. Irkinson watched a 4x2 ERF Elf) and a 6x4 S Series Foden tractor, both rated at 38 tonnes, return noise meter readings of 81dB(A) and 82dB(A) respectively at full revs in their noisest gears.
Both units were powered by specially-adapted Cummins LTAA10/35 diesel engines and the third new "hushed-up" 38tonne tractive unit, a 4x2 Perkins LE300-powered Foden S Series, returned 79dB(A). A Leyland Daf Roadrunner 10.15 4x2 rigid, powered by a Leyland Daf 310 diesel engine, gave a noise meter reading of 79.3dB(A). The quietest engine on show was a Perkins 4.40 Phaser fitted in a Renault 50 Series 4x2 rigid chassis which returned 75.7dB(A).
The demonstration marked the end of the Department of Transport-led £7 million QHV90 research project into quieter HGVs.