A diamond intersection on the road is a type of:
- AAt grade intersection
- BGrade separated intersectionCorrect
- CT intersection
- DFour way stop
Solution
Concept
A diamond interchange is a grade separated intersection. The major road passes over or under the minor road, and ramps connect the two.
Step-by-step solution
1. A diamond intersection has one road at a different level (flyover or underpass). 2. Four one-way ramps connect the two roads, so the plan looks like a diamond. 3. The roads cross at different levels, so it is a grade separated intersection.
Explanation
In a diamond interchange the major highway crosses the minor road at a different level. Four ramps form a diamond shape in plan. It is the simplest and most common grade separated interchange.
Why the other options are wrong
A: At grade means all roads meet at the same level, which is not true here. C: A T intersection is an at grade junction of three legs. D: A four way stop is an at grade control method with stop signs on all approaches.
Shortcut
Interchange names (diamond, cloverleaf, trumpet, rotary interchange) mean grade separated.
Common mistake
Thinking diamond is only a shape of an at grade junction. It is a type of interchange.
Correct answer: B) Grade separated intersection