an apparatus has been designed which measures accurately the time a drivers forward vision is interrupted when he reads his speedometer. using an existing optical head-up display projector a two digit number is displayed on a partially silvered glass plate mounted on the vehicles windscreen.simultaneously this number is indicated by the pointer of a meter which replaces the conventional speedometer. after a pre-set time interval the projected number on the glass plate changes. on observing the first head-up displayed number the driver has the task of comparing this number with that shown on the dashboard mounted meter,then, returning to his forward line of vision he declares whether or not the number he now sees has changed from that first observed. by alteration of the change-over period of the head-up displayed numbers the total time the drivers forward vision is interrupted can be determined.further possible applications of this apparatus are indicated.

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