Q4 belongs to a special type of work and must hold relevant certificates. After the certificate expires, it must be re-examined. After the expiration, go to the local or certification place to participate in training and pass the examination.

Q4 Special operation certificate is: gantry crane driver, with gantry crane operation qualification.

Tower cranes are commonly used in construction sites, and the code of tower crane special operation certificate is Q5. Q4 is not qualified to operate tower crane, so Q4' s special operation certificate cannot be used in the construction site, which is illegal (except for a bridge crane on the construction site). In general construction projects, the gantry crane will be used in the bridge prefabrication yard. It's rare on construction sites,