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This paper deals with the impacts of carbon oxides (C02) from motor exhaust emissions upon changes in the environment, warming up of the Earth and changes of regional and global climate. It has been established that the average annual emission from natural sources is 700 to 1000 x J09 tons of carbon oxides in conjunction with additional 30 x 109 tons introduced by human activities in burning fossil fuels of which some 17. 9 draw origin from mo tor traffic. Global annual concentrations of C02 increases by approximately 0,2% because human beings obtain some 90% of their power needs from burning fossil fuels. It has been established that in the world road motor vehicles emit 7,62 x 109 tons of co2 out of the total emission which is about 42,57 x l 09 tons in the year 1988. Road motor vehicles in Yugoslavia pollute the atmosphere with 21,41% x 106 tons with the annual increase of l, 78% and share in global pollution of 0,28% C02. In this pol1ution Croatia participates with 5,65 x 1()6 tons with the annual increase of 4,19% and its share in global pollution of 0,074% co2 . The author recommends gradual decrease of co2-emission by 50% through reduction of concentrations of 400 ppm in the air to the maximum which may only be attained by substitution in the consumption of fossil fuels. In road traffic gasoline and diesel fuels can successfully be substituted by hydrogen and thus help avoiding inevitable catastrophic consequences in the Earth's biosphere.

The development of the automobile industry has invigorated the development and advancement of the tire manufacturers. Considering the fact that the tire is a major factor of traffic safety it should be secured proper maintenance and inspection.

Constant increase of the number of automobiles causes demand for individual materials to get on the rise, thus giving an impulse to the development of recycling logistics. Used automobiles get disassembled and individual parts which can be used as raw materials or additives get recycled. Automobile tires can be reclaimed or vulcanized. In July 1978 the environmental-friendly "Blauer Engel" or "Blue Angel" symbol was first introduced for reclaimed tires. Later, emblems were introduced for other recycled automobile pans. The awarding of the emblem is being controlled and approved by authorized institutes, because the emblem rightfully designates traffic safety.

The paper deals with the composition and quantities of waste tires of motor vehicles and possibilities of their utilization as possible potential secondary raw materials. The possible quantities available in the world, in the territory of former Yugoslavia, and the city of Zagreb have been reviewed. The possible available quantities of waste tires (pneumatics) in the year 1991 are as follows: in the world this comes to l. 7 x JO pieces of which 84% is still on automobiles, in former Yugoslavia it comes to 9.637.466 pieces or 267.049 tons, and in Zagreb it comes to 862.780 pieces or 18.635 tons while only as /itl/e as less than JO% is collected. It has been established that radial/ tires on automobiles on the roads of Croatia are used up on covered 50.000 kilometers of journey, 8,2% of radial-ply tn1ck tires after 60.000 kilometers 15% and cross-ply 17.1%. Out of a number of methods of utilization of waste rubber pneumatics the environmental and economic highest advantage rests in recycling and processing in cryogen procedure into rubber powder (recycler).

This paper deals with the drugs which affect the psychophysical characteristic of man, commonly known as trigonic drugs. In the spirit of our regulations trigonic fall into the category of those drugs ultimately prohibited to motorists and machine operators and the category of those drugs known for possible effects upon the psychophysical characteristics of a motorist. It has been suggested to the motorists to study carefully respective instructions for use i.e. administration of these drugs and get familiar with the effects and side-effects of the medicine. Trigonics have been indicated to account for some 12% of all road traffic accidents reported causes.