Alamar 1.31. Tunnel - Alamun dokokin zirga-zirga na Tarayyar Rasha

Ramin da ba tare da hasken wucin gadi ba, ko rami mai iyakance ganuwa a ƙofar shiga.

An girka a cikin n. n. na 50-100 m, a waje n. p. - na 150-300 m, ana iya sanya alamar a wata tazara daban, amma an tsara nisan a Tebur 8.1.1 "Nisan abu".

Ayyukan:

1. A cikin rami a kan abin hawa mai motsawa, dole ne a kunna babbar katako ko tsotsan fitilun fitila.

2. A cikin rami, an hana shi: wucewa, tsayawa da ajiye motoci, juyawa, juyawa.