ᐅ Is noise from a street effectively reduced by a house or garage?

This concerns a planned new development consisting of several semi-detached houses (two floors, with pitched roofs) built directly next to each other, KfW55 standard, triple glazing. Garages will be built seamlessly between the houses. The houses are set back 5 meters (16 feet) from the street, which in some parts is heavily trafficked. Noise levels right at the street are typically high. The terrace is located directly behind the house, parallel to it, so there will be an uninterrupted row of houses and garages between the street and the garden.

My main question is: Will the noise on the terrace directly behind the house be noticeably lower or less disturbing? Or could noise be further reduced by adding side soundproof walls to create a U-shaped enclosure around the terrace? Behind the house and garden, there is a wide open field, so no buildings that could reflect sound back.

My purchase decision depends on this question, as everything else fits perfectly. According to the builder, noise inside the rooms will be minimal or not noticeable at all due to the very effective solid insulation.

Thanks in advance!