Incomplete combustion process is a potential source ofbenzo(a)pyrene (BaP) and tetrachlorodibenzo-p-dioxin(TCDD ). These compounds have been detected in effluents ofmunicipal incinerators, sewage sludge, cigarette smoke, automobileexhaust etc. Although BaP and TCD have carcinogenicpotential, in recent years these agents have received great attentiondue to their environmental persistence and remarkablyacute toxicity.To assess health risks associated with human exposure toBaP and TCDD, it was of interest to evaluate their effects uponhuman polymorphonuclear leucocytes by measuring the releaseof lysosomal and cytoplasmic enzymes.Suspensions of human polymorphonuclear leucocytes(PMNL) were treated with BaP, TCDD and BaP+ TCDD atconcentrations of 1 0·1, 1 Q-6M. These agents provoked a progressivetime- and dose-dependent release of lysosomal enzymebeta-N-acetyl-glucosaminidase and cytoplasmic enzyme lactate dehydrogenase, beta-GLM and LDH respectively. Atconcentrations listed TCDD was much more effective in realisingboth enzymes beta -G LM and LDH than BaP. In the experimentswith the combination of BaP+ TCDD, extracellular releaseof beta-GLM or LDH was significantly higher as comparedto BaP or TCDD-treated samples. lt seems possible thatTCDD affected the solubility of beta-GLM and LDH to agreater extent than the activity of BaP.The observations obtained in these studies suggest that BaPand TCDD damage the lysosomal and cellular membranes.

This paper presents a survey of strong bora wind. Bora windof extreme severity, which may blow along the entire Adriaticcoast, usually causes a lot of damage to the electrical power networkand a complete road and sea traffic disruption. Therefore,there is a growing need for introducing the bora risk factor intraffic planning.

Knowledge of traffic characteristics is useful to the highwayengineer in developing highway and transportation plans, performingeconomic analyses, establishing geometric design criteria,selecting and implementing traffic control measures, andevaluating the pe1[ormance of transportation facilities. Doze/ISof measures have been employed to describe the quality andquantity of traffic flow. This paper presents information onthose flow characteristics that fundamentally bear on the planning,design, and operation of highway and transport facilities:traffic speed, travel time, volume, and density.

The construction of the bridge mainland - Krk has integratedthe island of Krk into a unique road traffic system ofRijeka and the Croatian seaside. The bridge, together with theferryboat lines Senj and Baska, have significantly improved thetraffic connections of the islands of Cres and Rab, especiallywith Rijeka and the seaside of the counties: Primorsko-goranskaand Licko-senjska and Istarska zupanija.Apart from the connection of the island of Krk with themainland and the neighbouring islands, also the interurbanconnections within the islands are very important.The development of tourism will increase the significanceof the Krk Airport, especially during the tourist season.

In the past, traffic science did not always have the role andtask in accordance with its needs and abilities.The analyses reveal that scientific research in the field oftraffic has not always been in accordance with its characteristicsand did not app£v an adequate methodology which oftenbrought to suboptimum solutions.Accordingly, traffic science is treated as an independent scientificfield called 'traffic' within technical sciences. Thus,having a definite object of research it would best fulfill its roleand accomplish its task.

The paper presents, in broad outlines, the concept of theFormal Safety Assessment, a newly proposed official methodologyfor the rule-making process in IMO. It examines possiblepotentials and drawbacks of the proposed methodology and attemptsto identify the most important long-term consequencesof its application in the international shipping and shipboardoperations.

The paper presents Slovenian cargo shipping, its system oforganisation, ownership, age and value stntcture. It shows theimportance of shipping in the Slovenian overseas trade and itsimpact on the state's balance of payments. The analysis of thecompetitiveness of shipping was made from the viewpoint ofoperation costs and in comparison with the competitiveness ofEU shippers. The paper concludes with a proposal of possiblesystemic solutions which improve the competitiveness of Slovenianshipping.

A great number of very severe traffic accidents occurs as thedirect result of destabilisation of the vehicle negotiating a curve,most often caused by excessive speed of the vehicle for the givencurve configuration, and for the given surface condition. Therefore,the issue of determing the speed in negotiating curve is notjust a problem met by experts involved in the analysis of the actualtraffic accidents, but also a question without which the preventivesafety measures in road traffic cannot be thought of,both regarding the construction and design of the roads, and regardingspeed limitations at certain points. The aim of this papersis to define a exactly analyticall method for case of actualvehicle negotiating a curve situation.