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SUMMARY 
The Working Group IV/I Highway Engineering of the Internatio- 
nal Society of Photogrammetry has during the period 1968-72 
concentrated its work on two main items, namely, 
A. The application of photogrammetry to Highway Design. 
B. Digital Terrain Model, DTM - theory and practical appli- 
cation. 
The activity of the Working Group has been carried out by sym- 
posiums and conferences. A symposium was arranged in Rome, 
Italy, in the spring of 1969, when item A, above, was the main 
item. DTM, item B was discussed during a symposium in Bratis- 
lava, Czeckoslovakia in the fall of 1969. In 1970 a conference 
was arranged in Mexico City, concerning item A, with an empha- 
sis on Latin-American conditions. An number of smaller confe- 
rences have also been arranged in Ziirich, Switzerland. The 
Working Group has also been active during a UNO-Seminar in 
Zürich in March 1971. 
The report presents a summary of the results of the discussions 
within the Working Group during the period 1968-72. 
The first part of the report presents the main principles of 
the application of photogrammetry to the different stages of 
Highway Design. The combination of Photogrammetry and Terres- 
trial Surveying, Data Processing and Automatic Plotting is in- 
cluded. The importance of arranging the combination into a 
logical and simple system is emphasized in the report. 
The presented system of application is to be regarded as a 
"red line" from which deviations are made in different coun- 
tries, depending on local conditions as e.g. the availability 
of acceptable official maps. 
In a second part of the report the development of the appli- 
cation of Photogrammetry to Highway Design during the period 
1968-72 is discussed. It can thereby among others be stated 
that the development of instruments for the terrestrial mea- 
surement of distances and angles has had a great importance