Image Item No. Description  2009723  Cities and Transportation Activity Pack Catalog: Books: Curriculum Activity Book: Educational & Dacta: MINDSTORMS  9723b1  Set 9723 Activity Booklet 1 - Simple Traffic Lights Catalog: Books: Curriculum Activity Book: Educational & Dacta: MINDSTORMS  9723b2  Set 9723 Activity Booklet 2 - Traffic Monitoring Catalog: Books: Curriculum Activity Book: Educational & Dacta: MINDSTORMS  9723b3  Set 9723 Activity Booklet 3 - Intelligent Vehicles Catalog: Books: Curriculum Activity Book: Educational & Dacta: MINDSTORMS  9723b4  Set 9723 Activity Booklet 4 - Monorail Catalog: Books: Curriculum Activity Book: Educational & Dacta: MINDSTORMS