The average-weighted dollar exchange rate amounted to 31.70 RUR/USD in the first half of this morning's session on US currency, which was RUR0.01 higher that the previous rate. The dollar exchange rate has been advancing at the special session for the third day in a row. Dealers of commercial banks attribute this situation to the current favorable situation with ruble liquidity and lack of deficit on the market of ruble resources. The one-day ruble credit rate has been from four to six percent this morning, experts of commercial banks said in an interview with RosBusinessConsulting. The overnight credit rate was practically on the same level yesterday afternoon. Moreover, the Central Bank did not make currency interventions to support ruble on October 1, the experts stressed.