1.1 This practice covers the use of pneumatic road tube to detect axle hits used for recording vehicles or for the classification of vehicles as part of roadway traffic monitoring.

1.2 The practice applies only to pneumatic road tubes used for the detection of vehicle axles on a roadway.

1.3 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.