ARCADIS Designs Polish Traffic Solutions.

ARNHEM, The Netherlands -- ARCADIS (NASDAQ: ARCAF, EURONEXT: ARCAD), the international consulting and engineering company, today announced that it has been awarded a contract for the technical design of a 19.5 km long stretch of the Southern Warsaw Beltway (SWB) in Poland. The total contract value is approximately EUR 10 million. The design is expected to be completed in March 2008.

The construction of the SWB is part of a more extensive adjustment and extension of the infrastructure around Warsaw. Currently, five national roads connect through Warsaw and the beltway is a crucial factor in a plan to decrease traffic flow in the city's center. As previously announced, ARCADIS is already working on the design of another section of the Warsaw Beltway.

In addition to the design of the Warsaw Beltway, the company is also designing the Wroclaw By-pass. This 26 km long expressway will connect highway A-8 with two national roads and aims to alleviate traffic flow in the city's center. Completion of this design is expected in May 2006, with a contract value of approximately EUR 3 million.

"We have seen an increase of investments in Polish infrastructure based on funding from the European Union, and these investments are aimed at upgrading the network of Polish highways as a means of stimulating economic development," says Michel Jaski, Member of the ARCADIS Executive Board. "With a strong local presence in Poland for more than 10 years and extensive experience with infrastructure, we are pleased that ARCADIS can contribute to this process."

ARCADIS is an international company providing consultancy, engineering and management services in infrastructure, environment and facilities, to enhance mobility, sustainability and quality of life. ARCADIS develops, designs, implements, maintains and operates projects for companies and governments. With more than 10,000 employees and over EUR 1 billion in gross revenue, the company has an extensive international network that is supported by strong local market positions.

Except for historical information contained herein, the statements in this release are forward-looking statements that are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements involve known and unknown risks and uncertainties that may cause the company's actual results in future periods to differ materially from forecasted results. Those risks include, among others, risks associated with possible changes in environmental legislation and risks with regard to the Company's ability to acquire and execute projects. These are other risks are described in ARCADIS' filings with the Securities and Exchange Commission over the last 12 months, copies of which will be available from the SEC or may be obtained upon request from the Company.