Abstract: An imaging device (110) and a method for imaging at least one object (112), specifically for multispectral imaging or hyperspectral imaging, are disclosed. The imaging device (110) comprises I. at least one image sensor (114) located in at least one image plane (116) of the imaging device (110), the image sensor (114) comprising a plurality of photosensitive elements (118); II. at least one first imaging system (120) configured for generating at least one intermediate image (122) of the object (112) in at least one intermediate image plane (124); III. at least one second imaging system (132) configured for generating at least one image (134) of the intermediate image (122) on the image sensor (114) in the image plane (116); IV. at least one diffractive optical element (142) arranged in the intermediate image plane (124); and V.

Abstract: A method and apparatus for warning drivers as to the presence of a concealed hazard. A first step involves providing a sign capable of changing from an inactive mode to a warning mode upon receiving a signal. A second step involves providing a transmitter compatible with the signs receiver. A third step involves positioning the sign at a location along a highway that is visible a sufficient distance from the concealed hazard to provide warning to drivers of approaching vehicles. Where the concealed hazard is a concealed school bus stopping location, it is preferred that the transmitter be positioned in a school bus so as to enable a driver of the school bus to remotely change the sign from the inactive mode to the warning mode as the school bus approaches the concealed stopping location.