invalid carriage means a mechanically propelled vehicle of which the weight unladen does not exceed 254 kilograms and which is specially designed and constructed, and not merely adapted, for the use of a person suffering from some physical default or disability and is used solely by such a person;
Invalid means one who is physically or mentally incapacitated.
Invalid Drug Test means the result of a drug test for an oral fluid specimen that contains an unidentified adulterant, or an unidentified substance, that has abnormal physical characteristics, or that has an endogenous substance at an abnormal concentration preventing the laboratory from completing or obtaining a valid drug test result.
void means invalid with no result.
invalid carriage or other vehicle means a vehicle propelled by a petrol engine or by electric power supplied for use on the road and to be controlled by the occupant;